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Label Polynomial Discriminant Galois group Class group
21.21.103...456.1 x21 - 84x19 + 3024x17 - 60928x15 - 537x14 + 752640x13 + 30072x12 - 5870592x11 - 661584x10 + 28700672x9 + 7217280x8 - 84208818x7 - 40416768x6 + 132440952x5 + 107778048x4 - 70458304x3 - 107778048x2 - 38914176x - 3818312 \( 2^{12}\cdot 3^{28}\cdot 7^{32} \) $C_7^2:C_3:C_3$ (as 21T21) $[3]$ (GRH)
21.21.662...184.1 x21 - 84x19 + 3024x17 - 60928x15 - 138x14 + 752640x13 + 7728x12 - 5870592x11 - 170016x10 + 28700672x9 + 1854720x8 - 84318144x7 - 10386432x6 + 135502080x5 + 27697152x4 - 94947328x3 - 27697152x2 + 10063872x - 577536 \( 2^{18}\cdot 3^{28}\cdot 7^{32} \) $C_7^2:C_3:C_3$ (as 21T21) $[3]$ (GRH)
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