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Label Class Base field Conductor norm Rank Torsion CM Sato-Tate Regulator Period Leading coeff j-invariant Weierstrass coefficients Weierstrass equation
16.1-a1 16.1-a \(\Q(\sqrt{21}) \) \( 2^{4} \) 0 $\Z/2\Z$ $-3$ $N(\mathrm{U}(1))$ $1$ $17.69503190$ 0.965343132 \( 0 \) \( \bigl[0\) , \( -a - 1\) , \( 0\) , \( a + 2\) , \( -2\bigr] \) ${y}^2={x}^{3}+\left(-a-1\right){x}^{2}+\left(a+2\right){x}-2$
16.1-a2 16.1-a \(\Q(\sqrt{21}) \) \( 2^{4} \) 0 $\Z/2\Z$ $-3$ $N(\mathrm{U}(1))$ $1$ $17.69503190$ 0.965343132 \( 0 \) \( \bigl[0\) , \( a + 1\) , \( 0\) , \( a + 2\) , \( 0\bigr] \) ${y}^2={x}^{3}+\left(a+1\right){x}^{2}+\left(a+2\right){x}$
25.2-b1 25.2-b \(\Q(\sqrt{21}) \) \( 5^{2} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $0.139669982$ $16.42661250$ 1.001316654 \( 0 \) \( \bigl[0\) , \( a + 1\) , \( a + 1\) , \( a + 2\) , \( -2 a + 4\bigr] \) ${y}^2+\left(a+1\right){y}={x}^{3}+\left(a+1\right){x}^{2}+\left(a+2\right){x}-2a+4$
25.2-b2 25.2-b \(\Q(\sqrt{21}) \) \( 5^{2} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $0.046556660$ $16.42661250$ 1.001316654 \( 0 \) \( \bigl[0\) , \( -a - 1\) , \( a + 1\) , \( a + 2\) , \( -a - 2\bigr] \) ${y}^2+\left(a+1\right){y}={x}^{3}+\left(-a-1\right){x}^{2}+\left(a+2\right){x}-a-2$
25.3-b1 25.3-b \(\Q(\sqrt{21}) \) \( 5^{2} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $0.139669982$ $16.42661250$ 1.001316654 \( 0 \) \( \bigl[0\) , \( -a - 1\) , \( a\) , \( a + 2\) , \( a + 1\bigr] \) ${y}^2+a{y}={x}^{3}+\left(-a-1\right){x}^{2}+\left(a+2\right){x}+a+1$
25.3-b2 25.3-b \(\Q(\sqrt{21}) \) \( 5^{2} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $0.046556660$ $16.42661250$ 1.001316654 \( 0 \) \( \bigl[0\) , \( a + 1\) , \( a\) , \( a + 2\) , \( 0\bigr] \) ${y}^2+a{y}={x}^{3}+\left(a+1\right){x}^{2}+\left(a+2\right){x}$
49.1-a1 49.1-a \(\Q(\sqrt{21}) \) \( 7^{2} \) 0 $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1$ $7.676076964$ 1.675057320 \( 0 \) \( \bigl[0\) , \( -a - 1\) , \( 1\) , \( a + 2\) , \( 5 a - 16\bigr] \) ${y}^2+{y}={x}^{3}+\left(-a-1\right){x}^{2}+\left(a+2\right){x}+5a-16$
49.1-a2 49.1-a \(\Q(\sqrt{21}) \) \( 7^{2} \) 0 $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1$ $7.676076964$ 1.675057320 \( 0 \) \( \bigl[0\) , \( a + 1\) , \( 1\) , \( a + 2\) , \( -5 a - 9\bigr] \) ${y}^2+{y}={x}^{3}+\left(a+1\right){x}^{2}+\left(a+2\right){x}-5a-9$
81.1-a3 81.1-a \(\Q(\sqrt{21}) \) \( 3^{4} \) 0 $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1$ $9.363037422$ 2.043182272 \( 0 \) \( \bigl[0\) , \( 0\) , \( 1\) , \( 0\) , \( 3 a + 5\bigr] \) ${y}^2+{y}={x}^{3}+3a+5$
81.1-a4 81.1-a \(\Q(\sqrt{21}) \) \( 3^{4} \) 0 $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1$ $9.363037422$ 2.043182272 \( 0 \) \( \bigl[0\) , \( 0\) , \( 1\) , \( 0\) , \( -3 a + 8\bigr] \) ${y}^2+{y}={x}^{3}-3a+8$
81.1-b3 81.1-b \(\Q(\sqrt{21}) \) \( 3^{4} \) 0 $\Z/3\Z$ $-3$ $N(\mathrm{U}(1))$ $1$ $28.08911226$ 0.681060757 \( 0 \) \( \bigl[0\) , \( 0\) , \( 1\) , \( 0\) , \( 0\bigr] \) ${y}^2+{y}={x}^{3}$
81.1-b4 81.1-b \(\Q(\sqrt{21}) \) \( 3^{4} \) 0 $\Z/3\Z$ $-3$ $N(\mathrm{U}(1))$ $1$ $9.363037422$ 0.681060757 \( 0 \) \( \bigl[0\) , \( 0\) , \( 1\) , \( 0\) , \( 6 a - 17\bigr] \) ${y}^2+{y}={x}^{3}+6a-17$
144.1-a1 144.1-a \(\Q(\sqrt{21}) \) \( 2^{4} \cdot 3^{2} \) $1$ $\Z/2\Z$ $-3$ $N(\mathrm{U}(1))$ $0.526895372$ $5.898343969$ 2.034539317 \( 0 \) \( \bigl[0\) , \( 0\) , \( 0\) , \( 0\) , \( -24 a - 43\bigr] \) ${y}^2={x}^{3}-24a-43$
144.1-a2 144.1-a \(\Q(\sqrt{21}) \) \( 2^{4} \cdot 3^{2} \) $1$ $\Z/6\Z$ $-3$ $N(\mathrm{U}(1))$ $1.580686117$ $17.69503190$ 2.034539317 \( 0 \) \( \bigl[0\) , \( 0\) , \( 0\) , \( 0\) , \( 1\bigr] \) ${y}^2={x}^{3}+1$
225.2-b1 225.2-b \(\Q(\sqrt{21}) \) \( 3^{2} \cdot 5^{2} \) 0 $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1$ $5.475537501$ 2.389720482 \( 0 \) \( \bigl[0\) , \( 0\) , \( a + 1\) , \( 0\) , \( -4\bigr] \) ${y}^2+\left(a+1\right){y}={x}^{3}-4$
225.2-b2 225.2-b \(\Q(\sqrt{21}) \) \( 3^{2} \cdot 5^{2} \) 0 $\Z/3\Z$ $-3$ $N(\mathrm{U}(1))$ $1$ $16.42661250$ 2.389720482 \( 0 \) \( \bigl[0\) , \( 0\) , \( a + 1\) , \( 0\) , \( 9 a + 16\bigr] \) ${y}^2+\left(a+1\right){y}={x}^{3}+9a+16$
225.3-b1 225.3-b \(\Q(\sqrt{21}) \) \( 3^{2} \cdot 5^{2} \) 0 $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1$ $5.475537501$ 2.389720482 \( 0 \) \( \bigl[0\) , \( 0\) , \( a\) , \( 0\) , \( -a - 3\bigr] \) ${y}^2+a{y}={x}^{3}-a-3$
225.3-b2 225.3-b \(\Q(\sqrt{21}) \) \( 3^{2} \cdot 5^{2} \) 0 $\Z/3\Z$ $-3$ $N(\mathrm{U}(1))$ $1$ $16.42661250$ 2.389720482 \( 0 \) \( \bigl[0\) , \( 0\) , \( a\) , \( 0\) , \( -10 a + 26\bigr] \) ${y}^2+a{y}={x}^{3}-10a+26$
256.1-d1 256.1-d \(\Q(\sqrt{21}) \) \( 2^{8} \) 0 $\Z/2\Z$ $-3$ $N(\mathrm{U}(1))$ $1$ $17.69503190$ 0.965343132 \( 0 \) \( \bigl[0\) , \( -a - 1\) , \( 0\) , \( a + 2\) , \( 0\bigr] \) ${y}^2={x}^{3}+\left(-a-1\right){x}^{2}+\left(a+2\right){x}$
256.1-d2 256.1-d \(\Q(\sqrt{21}) \) \( 2^{8} \) 0 $\Z/2\Z$ $-3$ $N(\mathrm{U}(1))$ $1$ $17.69503190$ 0.965343132 \( 0 \) \( \bigl[0\) , \( a + 1\) , \( 0\) , \( a + 2\) , \( 2\bigr] \) ${y}^2={x}^{3}+\left(a+1\right){x}^{2}+\left(a+2\right){x}+2$
400.2-a1 400.2-a \(\Q(\sqrt{21}) \) \( 2^{4} \cdot 5^{2} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1.743375040$ $3.812279058$ 2.900653519 \( 0 \) \( \bigl[0\) , \( a + 1\) , \( 0\) , \( a + 2\) , \( -8 a + 3\bigr] \) ${y}^2={x}^{3}+\left(a+1\right){x}^{2}+\left(a+2\right){x}-8a+3$
400.2-a2 400.2-a \(\Q(\sqrt{21}) \) \( 2^{4} \cdot 5^{2} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $0.581125013$ $3.812279058$ 2.900653519 \( 0 \) \( \bigl[0\) , \( -a - 1\) , \( 0\) , \( a + 2\) , \( 416 a - 1163\bigr] \) ${y}^2={x}^{3}+\left(-a-1\right){x}^{2}+\left(a+2\right){x}+416a-1163$
400.3-a1 400.3-a \(\Q(\sqrt{21}) \) \( 2^{4} \cdot 5^{2} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1.743375040$ $3.812279058$ 2.900653519 \( 0 \) \( \bigl[0\) , \( -a - 1\) , \( 0\) , \( a + 2\) , \( 8 a - 7\bigr] \) ${y}^2={x}^{3}+\left(-a-1\right){x}^{2}+\left(a+2\right){x}+8a-7$
400.3-a2 400.3-a \(\Q(\sqrt{21}) \) \( 2^{4} \cdot 5^{2} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $0.581125013$ $3.812279058$ 2.900653519 \( 0 \) \( \bigl[0\) , \( a + 1\) , \( 0\) , \( a + 2\) , \( -416 a - 745\bigr] \) ${y}^2={x}^{3}+\left(a+1\right){x}^{2}+\left(a+2\right){x}-416a-745$
441.1-d1 441.1-d \(\Q(\sqrt{21}) \) \( 3^{2} \cdot 7^{2} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $0.298091926$ $2.558692321$ 1.997284256 \( 0 \) \( \bigl[0\) , \( 0\) , \( 1\) , \( 0\) , \( -294 a - 527\bigr] \) ${y}^2+{y}={x}^{3}-294a-527$
441.1-d2 441.1-d \(\Q(\sqrt{21}) \) \( 3^{2} \cdot 7^{2} \) $1$ $\Z/3\Z$ $-3$ $N(\mathrm{U}(1))$ $0.894275780$ $7.676076964$ 1.997284256 \( 0 \) \( \bigl[0\) , \( 0\) , \( 1\) , \( 0\) , \( 12\bigr] \) ${y}^2+{y}={x}^{3}+12$
625.1-c1 625.1-c \(\Q(\sqrt{21}) \) \( 5^{4} \) 0 $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1$ $16.42661250$ 3.584580724 \( 0 \) \( \bigl[0\) , \( -a - 1\) , \( 1\) , \( a + 2\) , \( -a - 2\bigr] \) ${y}^2+{y}={x}^{3}+\left(-a-1\right){x}^{2}+\left(a+2\right){x}-a-2$
625.1-c2 625.1-c \(\Q(\sqrt{21}) \) \( 5^{4} \) 0 $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1$ $16.42661250$ 3.584580724 \( 0 \) \( \bigl[0\) , \( a + 1\) , \( 1\) , \( a + 2\) , \( a - 1\bigr] \) ${y}^2+{y}={x}^{3}+\left(a+1\right){x}^{2}+\left(a+2\right){x}+a-1$
625.1-j1 625.1-j \(\Q(\sqrt{21}) \) \( 5^{4} \) 0 $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1$ $3.285322500$ 1.433832289 \( 0 \) \( \bigl[0\) , \( -a - 1\) , \( a + 1\) , \( a + 2\) , \( -213 a + 588\bigr] \) ${y}^2+\left(a+1\right){y}={x}^{3}+\left(-a-1\right){x}^{2}+\left(a+2\right){x}-213a+588$
625.1-j2 625.1-j \(\Q(\sqrt{21}) \) \( 5^{4} \) 0 $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1$ $3.285322500$ 1.433832289 \( 0 \) \( \bigl[0\) , \( a + 1\) , \( a + 1\) , \( a + 2\) , \( 24 a + 34\bigr] \) ${y}^2+\left(a+1\right){y}={x}^{3}+\left(a+1\right){x}^{2}+\left(a+2\right){x}+24a+34$
625.1-p1 625.1-p \(\Q(\sqrt{21}) \) \( 5^{4} \) 0 $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1$ $3.285322500$ 2.150748434 \( 0 \) \( \bigl[0\) , \( -a - 1\) , \( 1\) , \( a + 2\) , \( 69 a - 192\bigr] \) ${y}^2+{y}={x}^{3}+\left(-a-1\right){x}^{2}+\left(a+2\right){x}+69a-192$
625.1-p2 625.1-p \(\Q(\sqrt{21}) \) \( 5^{4} \) 0 $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1$ $3.285322500$ 2.150748434 \( 0 \) \( \bigl[0\) , \( a + 1\) , \( 1\) , \( a + 2\) , \( -69 a - 121\bigr] \) ${y}^2+{y}={x}^{3}+\left(a+1\right){x}^{2}+\left(a+2\right){x}-69a-121$
625.1-q1 625.1-q \(\Q(\sqrt{21}) \) \( 5^{4} \) 0 $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1$ $3.285322500$ 1.433832289 \( 0 \) \( \bigl[0\) , \( -a - 1\) , \( a\) , \( a + 2\) , \( -25 a + 57\bigr] \) ${y}^2+a{y}={x}^{3}+\left(-a-1\right){x}^{2}+\left(a+2\right){x}-25a+57$
625.1-q2 625.1-q \(\Q(\sqrt{21}) \) \( 5^{4} \) 0 $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1$ $3.285322500$ 1.433832289 \( 0 \) \( \bigl[0\) , \( a + 1\) , \( a\) , \( a + 2\) , \( 212 a + 378\bigr] \) ${y}^2+a{y}={x}^{3}+\left(a+1\right){x}^{2}+\left(a+2\right){x}+212a+378$
729.1-a1 729.1-a \(\Q(\sqrt{21}) \) \( 3^{6} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $0.690454106$ $9.363037422$ 2.821447178 \( 0 \) \( \bigl[0\) , \( 0\) , \( a + 1\) , \( 0\) , \( -15 a - 27\bigr] \) ${y}^2+\left(a+1\right){y}={x}^{3}-15a-27$
729.1-a2 729.1-a \(\Q(\sqrt{21}) \) \( 3^{6} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $0.230151368$ $9.363037422$ 2.821447178 \( 0 \) \( \bigl[0\) , \( 0\) , \( a + 1\) , \( 0\) , \( -3\bigr] \) ${y}^2+\left(a+1\right){y}={x}^{3}-3$
729.1-b1 729.1-b \(\Q(\sqrt{21}) \) \( 3^{6} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $0.690454106$ $9.363037422$ 2.821447178 \( 0 \) \( \bigl[0\) , \( 0\) , \( a\) , \( 0\) , \( 14 a - 41\bigr] \) ${y}^2+a{y}={x}^{3}+14a-41$
729.1-b2 729.1-b \(\Q(\sqrt{21}) \) \( 3^{6} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $0.230151368$ $9.363037422$ 2.821447178 \( 0 \) \( \bigl[0\) , \( 0\) , \( a\) , \( 0\) , \( -a - 2\bigr] \) ${y}^2+a{y}={x}^{3}-a-2$
729.1-c1 729.1-c \(\Q(\sqrt{21}) \) \( 3^{6} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $0.977127928$ $9.363037422$ 3.992900922 \( 0 \) \( \bigl[0\) , \( 0\) , \( a\) , \( 0\) , \( -2\bigr] \) ${y}^2+a{y}={x}^{3}-2$
729.1-c2 729.1-c \(\Q(\sqrt{21}) \) \( 3^{6} \) $1$ $\Z/3\Z$ $-3$ $N(\mathrm{U}(1))$ $2.931383785$ $28.08911226$ 3.992900922 \( 0 \) \( \bigl[0\) , \( 0\) , \( a\) , \( 0\) , \( a + 1\bigr] \) ${y}^2+a{y}={x}^{3}+a+1$
729.1-d1 729.1-d \(\Q(\sqrt{21}) \) \( 3^{6} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $0.977127928$ $9.363037422$ 3.992900922 \( 0 \) \( \bigl[0\) , \( 0\) , \( a + 1\) , \( 0\) , \( -a - 2\bigr] \) ${y}^2+\left(a+1\right){y}={x}^{3}-a-2$
729.1-d2 729.1-d \(\Q(\sqrt{21}) \) \( 3^{6} \) $1$ $\Z/3\Z$ $-3$ $N(\mathrm{U}(1))$ $2.931383785$ $28.08911226$ 3.992900922 \( 0 \) \( \bigl[0\) , \( 0\) , \( a + 1\) , \( 0\) , \( -2 a + 2\bigr] \) ${y}^2+\left(a+1\right){y}={x}^{3}-2a+2$
784.1-e1 784.1-e \(\Q(\sqrt{21}) \) \( 2^{4} \cdot 7^{2} \) 0 $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1$ $5.827272664$ 1.271615146 \( 0 \) \( \bigl[0\) , \( -a - 1\) , \( 0\) , \( a + 2\) , \( 12 a + 21\bigr] \) ${y}^2={x}^{3}+\left(-a-1\right){x}^{2}+\left(a+2\right){x}+12a+21$
784.1-e2 784.1-e \(\Q(\sqrt{21}) \) \( 2^{4} \cdot 7^{2} \) 0 $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1$ $5.827272664$ 1.271615146 \( 0 \) \( \bigl[0\) , \( a + 1\) , \( 0\) , \( a + 2\) , \( -12 a + 35\bigr] \) ${y}^2={x}^{3}+\left(a+1\right){x}^{2}+\left(a+2\right){x}-12a+35$
1225.2-a1 1225.2-a \(\Q(\sqrt{21}) \) \( 5^{2} \cdot 7^{2} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1.248524248$ $5.021791350$ 2.736377394 \( 0 \) \( \bigl[0\) , \( a + 1\) , \( a\) , \( a + 2\) , \( -182 a + 508\bigr] \) ${y}^2+a{y}={x}^{3}+\left(a+1\right){x}^{2}+\left(a+2\right){x}-182a+508$
1225.2-a2 1225.2-a \(\Q(\sqrt{21}) \) \( 5^{2} \cdot 7^{2} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $0.416174749$ $5.021791350$ 2.736377394 \( 0 \) \( \bigl[0\) , \( -a - 1\) , \( a\) , \( a + 2\) , \( 3 a - 3\bigr] \) ${y}^2+a{y}={x}^{3}+\left(-a-1\right){x}^{2}+\left(a+2\right){x}+3a-3$
1225.2-b1 1225.2-b \(\Q(\sqrt{21}) \) \( 5^{2} \cdot 7^{2} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $1.382361320$ $7.351149817$ 4.435036470 \( 0 \) \( \bigl[0\) , \( -a - 1\) , \( a\) , \( a + 2\) , \( 17 a + 32\bigr] \) ${y}^2+a{y}={x}^{3}+\left(-a-1\right){x}^{2}+\left(a+2\right){x}+17a+32$
1225.2-b2 1225.2-b \(\Q(\sqrt{21}) \) \( 5^{2} \cdot 7^{2} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $4.147083961$ $2.450383272$ 4.435036470 \( 0 \) \( \bigl[0\) , \( a + 1\) , \( a\) , \( a + 2\) , \( 56 a - 157\bigr] \) ${y}^2+a{y}={x}^{3}+\left(a+1\right){x}^{2}+\left(a+2\right){x}+56a-157$
1225.2-c1 1225.2-c \(\Q(\sqrt{21}) \) \( 5^{2} \cdot 7^{2} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $0.156143787$ $15.73127654$ 2.144070295 \( 0 \) \( \bigl[0\) , \( -a - 1\) , \( 1\) , \( a + 2\) , \( -18 a + 48\bigr] \) ${y}^2+{y}={x}^{3}+\left(-a-1\right){x}^{2}+\left(a+2\right){x}-18a+48$
1225.2-c2 1225.2-c \(\Q(\sqrt{21}) \) \( 5^{2} \cdot 7^{2} \) $1$ $\mathsf{trivial}$ $-3$ $N(\mathrm{U}(1))$ $0.468431363$ $5.243758848$ 2.144070295 \( 0 \) \( \bigl[0\) , \( a + 1\) , \( 1\) , \( a + 2\) , \( -1\bigr] \) ${y}^2+{y}={x}^{3}+\left(a+1\right){x}^{2}+\left(a+2\right){x}-1$
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  *The rank, regulator and analytic order of Ш are not known for all curves in the database; curves for which these are unknown will not appear in searches specifying one of these quantities.