Properties

Label 21.3.b.a
Level 21
Weight 3
Character orbit 21.b
Analytic conductor 0.572
Analytic rank 0
Dimension 4
CM no
Inner twists 2

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Newspace parameters

Level: \( N \) \(=\) \( 21 = 3 \cdot 7 \)
Weight: \( k \) \(=\) \( 3 \)
Character orbit: \([\chi]\) \(=\) 21.b (of order \(2\), degree \(1\), minimal)

Newform invariants

Self dual: no
Analytic conductor: \(0.572208555157\)
Analytic rank: \(0\)
Dimension: \(4\)
Coefficient field: 4.0.65856.1
Defining polynomial: \(x^{4} + 14 x^{2} + 21\)
Coefficient ring: \(\Z[a_1, a_2, a_3]\)
Coefficient ring index: \( 1 \)
Twist minimal: yes
Sato-Tate group: $\mathrm{SU}(2)[C_{2}]$

$q$-expansion

Coefficients of the \(q\)-expansion are expressed in terms of a basis \(1,\beta_1,\beta_2,\beta_3\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.

\(f(q)\) \(=\) \( q + \beta_{1} q^{2} + ( -\beta_{1} - \beta_{2} + \beta_{3} ) q^{3} + ( -3 + 2 \beta_{2} ) q^{4} + ( -1 + \beta_{2} - 2 \beta_{3} ) q^{5} + ( 3 + \beta_{1} - 2 \beta_{2} - \beta_{3} ) q^{6} -\beta_{2} q^{7} + ( 2 - 5 \beta_{1} - 2 \beta_{2} + 4 \beta_{3} ) q^{8} + ( -6 - \beta_{1} + 2 \beta_{2} - 2 \beta_{3} ) q^{9} +O(q^{10})\) \( q + \beta_{1} q^{2} + ( -\beta_{1} - \beta_{2} + \beta_{3} ) q^{3} + ( -3 + 2 \beta_{2} ) q^{4} + ( -1 + \beta_{2} - 2 \beta_{3} ) q^{5} + ( 3 + \beta_{1} - 2 \beta_{2} - \beta_{3} ) q^{6} -\beta_{2} q^{7} + ( 2 - 5 \beta_{1} - 2 \beta_{2} + 4 \beta_{3} ) q^{8} + ( -6 - \beta_{1} + 2 \beta_{2} - 2 \beta_{3} ) q^{9} + ( 7 + \beta_{2} ) q^{10} + 2 \beta_{1} q^{11} + ( -6 + 7 \beta_{1} + \beta_{2} - \beta_{3} ) q^{12} + ( -9 + \beta_{2} ) q^{13} + ( -1 + 3 \beta_{1} + \beta_{2} - 2 \beta_{3} ) q^{14} + ( 9 - \beta_{1} + 2 \beta_{2} + 4 \beta_{3} ) q^{15} + ( 9 - 4 \beta_{2} ) q^{16} + ( 2 - 2 \beta_{1} - 2 \beta_{2} + 4 \beta_{3} ) q^{17} + ( 15 - 8 \beta_{1} - 2 \beta_{2} + 2 \beta_{3} ) q^{18} + ( 3 - 5 \beta_{2} ) q^{19} + ( -3 + 4 \beta_{1} + 3 \beta_{2} - 6 \beta_{3} ) q^{20} + ( 3 - 2 \beta_{1} + \beta_{2} - \beta_{3} ) q^{21} + ( -14 + 4 \beta_{2} ) q^{22} + ( -2 + 8 \beta_{1} + 2 \beta_{2} - 4 \beta_{3} ) q^{23} + ( -33 - 3 \beta_{1} + 6 \beta_{2} - 3 \beta_{3} ) q^{24} + ( -3 - 10 \beta_{2} ) q^{25} + ( 1 - 12 \beta_{1} - \beta_{2} + 2 \beta_{3} ) q^{26} + ( 3 + 5 \beta_{1} + 8 \beta_{2} + \beta_{3} ) q^{27} + ( -14 + 3 \beta_{2} ) q^{28} + ( -2 - 2 \beta_{1} + 2 \beta_{2} - 4 \beta_{3} ) q^{29} + ( -3 - 5 \beta_{1} - 8 \beta_{2} + 8 \beta_{3} ) q^{30} + ( 34 + 2 \beta_{2} ) q^{31} + ( 4 + \beta_{1} - 4 \beta_{2} + 8 \beta_{3} ) q^{32} + ( 6 + 2 \beta_{1} - 4 \beta_{2} - 2 \beta_{3} ) q^{33} -6 \beta_{2} q^{34} + ( 3 - 2 \beta_{1} - 3 \beta_{2} + 6 \beta_{3} ) q^{35} + ( 24 + 13 \beta_{1} - 8 \beta_{2} - 10 \beta_{3} ) q^{36} + ( 4 + 14 \beta_{2} ) q^{37} + ( -5 + 18 \beta_{1} + 5 \beta_{2} - 10 \beta_{3} ) q^{38} + ( -3 + 11 \beta_{1} + 8 \beta_{2} - 8 \beta_{3} ) q^{39} + ( 21 + 15 \beta_{2} ) q^{40} + ( 8 - 22 \beta_{1} - 8 \beta_{2} + 16 \beta_{3} ) q^{41} + ( 18 + 2 \beta_{1} - 4 \beta_{2} + \beta_{3} ) q^{42} + ( -40 - 6 \beta_{2} ) q^{43} + ( 4 - 18 \beta_{1} - 4 \beta_{2} + 8 \beta_{3} ) q^{44} + ( -33 + 2 \beta_{1} - 13 \beta_{2} + 4 \beta_{3} ) q^{45} + ( -42 + 18 \beta_{2} ) q^{46} + ( 4 + 8 \beta_{1} - 4 \beta_{2} + 8 \beta_{3} ) q^{47} + ( 12 - 17 \beta_{1} - 5 \beta_{2} + 5 \beta_{3} ) q^{48} + 7 q^{49} + ( -10 + 27 \beta_{1} + 10 \beta_{2} - 20 \beta_{3} ) q^{50} + ( -24 - 6 \beta_{3} ) q^{51} + ( 41 - 21 \beta_{2} ) q^{52} + ( -16 + 10 \beta_{1} + 16 \beta_{2} - 32 \beta_{3} ) q^{53} + ( -30 - 23 \beta_{1} + \beta_{2} + 17 \beta_{3} ) q^{54} + ( 14 + 2 \beta_{2} ) q^{55} + ( -1 - 11 \beta_{1} + \beta_{2} - 2 \beta_{3} ) q^{56} + ( 15 - 13 \beta_{1} + 2 \beta_{2} - 2 \beta_{3} ) q^{57} + ( 28 - 2 \beta_{2} ) q^{58} + ( -1 - 26 \beta_{1} + \beta_{2} - 2 \beta_{3} ) q^{59} + ( 39 + \beta_{1} - 2 \beta_{2} + 8 \beta_{3} ) q^{60} + ( -39 + 7 \beta_{2} ) q^{61} + ( 2 + 28 \beta_{1} - 2 \beta_{2} + 4 \beta_{3} ) q^{62} + ( -3 - 5 \beta_{1} + \beta_{2} + 8 \beta_{3} ) q^{63} + ( 1 - 18 \beta_{2} ) q^{64} + ( 6 + 2 \beta_{1} - 6 \beta_{2} + 12 \beta_{3} ) q^{65} + ( -12 + 22 \beta_{1} + 10 \beta_{2} - 10 \beta_{3} ) q^{66} + ( -6 - 8 \beta_{2} ) q^{67} + ( 2 + 10 \beta_{1} - 2 \beta_{2} + 4 \beta_{3} ) q^{68} + ( 42 + 6 \beta_{1} - 12 \beta_{2} ) q^{69} + ( -7 - 7 \beta_{2} ) q^{70} + ( 6 + 18 \beta_{1} - 6 \beta_{2} + 12 \beta_{3} ) q^{71} + ( -9 + 36 \beta_{1} + 36 \beta_{2} - 18 \beta_{3} ) q^{72} + ( -8 + 26 \beta_{2} ) q^{73} + ( 14 - 38 \beta_{1} - 14 \beta_{2} + 28 \beta_{3} ) q^{74} + ( 30 - 17 \beta_{1} + 13 \beta_{2} - 13 \beta_{3} ) q^{75} + ( -79 + 21 \beta_{2} ) q^{76} + ( -2 + 6 \beta_{1} + 2 \beta_{2} - 4 \beta_{3} ) q^{77} + ( -45 - 11 \beta_{1} + 22 \beta_{2} + 8 \beta_{3} ) q^{78} + ( 32 - 36 \beta_{2} ) q^{79} + ( 3 - 8 \beta_{1} - 3 \beta_{2} + 6 \beta_{3} ) q^{80} + ( -15 + 20 \beta_{1} - 22 \beta_{2} + 4 \beta_{3} ) q^{81} + ( 98 - 52 \beta_{2} ) q^{82} + ( -9 - 18 \beta_{1} + 9 \beta_{2} - 18 \beta_{3} ) q^{83} + ( -9 + 20 \beta_{1} + 11 \beta_{2} - 11 \beta_{3} ) q^{84} + ( 42 + 18 \beta_{2} ) q^{85} + ( -6 - 22 \beta_{1} + 6 \beta_{2} - 12 \beta_{3} ) q^{86} + ( 12 - 4 \beta_{1} + 8 \beta_{2} + 10 \beta_{3} ) q^{87} + ( 42 - 24 \beta_{2} ) q^{88} + ( -16 + 42 \beta_{1} + 16 \beta_{2} - 32 \beta_{3} ) q^{89} + ( -39 - 2 \beta_{1} + 13 \beta_{2} - 22 \beta_{3} ) q^{90} + ( -7 + 9 \beta_{2} ) q^{91} + ( 10 - 64 \beta_{1} - 10 \beta_{2} + 20 \beta_{3} ) q^{92} + ( -6 - 30 \beta_{1} - 36 \beta_{2} + 36 \beta_{3} ) q^{93} + ( -84 + 12 \beta_{2} ) q^{94} + ( 12 - 10 \beta_{1} - 12 \beta_{2} + 24 \beta_{3} ) q^{95} + ( -33 + 5 \beta_{1} - 10 \beta_{2} - 17 \beta_{3} ) q^{96} + ( -2 + 8 \beta_{2} ) q^{97} + 7 \beta_{1} q^{98} + ( 30 - 16 \beta_{1} - 4 \beta_{2} + 4 \beta_{3} ) q^{99} +O(q^{100})\)
\(\operatorname{Tr}(f)(q)\) \(=\) \( 4q - 2q^{3} - 12q^{4} + 14q^{6} - 20q^{9} + O(q^{10}) \) \( 4q - 2q^{3} - 12q^{4} + 14q^{6} - 20q^{9} + 28q^{10} - 22q^{12} - 36q^{13} + 28q^{15} + 36q^{16} + 56q^{18} + 12q^{19} + 14q^{21} - 56q^{22} - 126q^{24} - 12q^{25} + 10q^{27} - 56q^{28} - 28q^{30} + 136q^{31} + 28q^{33} + 116q^{36} + 16q^{37} + 4q^{39} + 84q^{40} + 70q^{42} - 160q^{43} - 140q^{45} - 168q^{46} + 38q^{48} + 28q^{49} - 84q^{51} + 164q^{52} - 154q^{54} + 56q^{55} + 64q^{57} + 112q^{58} + 140q^{60} - 156q^{61} - 28q^{63} + 4q^{64} - 28q^{66} - 24q^{67} + 168q^{69} - 28q^{70} - 32q^{73} + 146q^{75} - 316q^{76} - 196q^{78} + 128q^{79} - 68q^{81} + 392q^{82} - 14q^{84} + 168q^{85} + 28q^{87} + 168q^{88} - 112q^{90} - 28q^{91} - 96q^{93} - 336q^{94} - 98q^{96} - 8q^{97} + 112q^{99} + O(q^{100}) \)

Basis of coefficient ring in terms of a root \(\nu\) of \(x^{4} + 14 x^{2} + 21\):

\(\beta_{0}\)\(=\)\( 1 \)
\(\beta_{1}\)\(=\)\( \nu \)
\(\beta_{2}\)\(=\)\((\)\( \nu^{2} + 7 \)\()/2\)
\(\beta_{3}\)\(=\)\((\)\( \nu^{3} + \nu^{2} + 13 \nu + 5 \)\()/4\)
\(1\)\(=\)\(\beta_0\)
\(\nu\)\(=\)\(\beta_{1}\)
\(\nu^{2}\)\(=\)\(2 \beta_{2} - 7\)
\(\nu^{3}\)\(=\)\(4 \beta_{3} - 2 \beta_{2} - 13 \beta_{1} + 2\)

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/21\mathbb{Z}\right)^\times\).

\(n\) \(8\) \(10\)
\(\chi(n)\) \(-1\) \(1\)

Embeddings

For each embedding \(\iota_m\) of the coefficient field, the values \(\iota_m(a_n)\) are shown below.

For more information on an embedded modular form you can click on its label.

Label \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
8.1
3.50592i
1.30710i
1.30710i
3.50592i
3.50592i 0.822876 + 2.88494i −8.29150 1.24197i 10.1144 2.88494i 2.64575 15.0457i −7.64575 + 4.74789i 4.35425
8.2 1.30710i −1.82288 2.38267i 2.29150 7.37953i −3.11438 + 2.38267i −2.64575 8.22359i −2.35425 + 8.68663i 9.64575
8.3 1.30710i −1.82288 + 2.38267i 2.29150 7.37953i −3.11438 2.38267i −2.64575 8.22359i −2.35425 8.68663i 9.64575
8.4 3.50592i 0.822876 2.88494i −8.29150 1.24197i 10.1144 + 2.88494i 2.64575 15.0457i −7.64575 4.74789i 4.35425
\(n\): e.g. 2-40 or 990-1000
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
3.b odd 2 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 21.3.b.a 4
3.b odd 2 1 inner 21.3.b.a 4
4.b odd 2 1 336.3.d.c 4
5.b even 2 1 525.3.c.a 4
5.c odd 4 2 525.3.f.a 8
7.b odd 2 1 147.3.b.f 4
7.c even 3 2 147.3.h.e 8
7.d odd 6 2 147.3.h.c 8
8.b even 2 1 1344.3.d.f 4
8.d odd 2 1 1344.3.d.b 4
9.c even 3 2 567.3.r.c 8
9.d odd 6 2 567.3.r.c 8
12.b even 2 1 336.3.d.c 4
15.d odd 2 1 525.3.c.a 4
15.e even 4 2 525.3.f.a 8
21.c even 2 1 147.3.b.f 4
21.g even 6 2 147.3.h.c 8
21.h odd 6 2 147.3.h.e 8
24.f even 2 1 1344.3.d.b 4
24.h odd 2 1 1344.3.d.f 4
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
21.3.b.a 4 1.a even 1 1 trivial
21.3.b.a 4 3.b odd 2 1 inner
147.3.b.f 4 7.b odd 2 1
147.3.b.f 4 21.c even 2 1
147.3.h.c 8 7.d odd 6 2
147.3.h.c 8 21.g even 6 2
147.3.h.e 8 7.c even 3 2
147.3.h.e 8 21.h odd 6 2
336.3.d.c 4 4.b odd 2 1
336.3.d.c 4 12.b even 2 1
525.3.c.a 4 5.b even 2 1
525.3.c.a 4 15.d odd 2 1
525.3.f.a 8 5.c odd 4 2
525.3.f.a 8 15.e even 4 2
567.3.r.c 8 9.c even 3 2
567.3.r.c 8 9.d odd 6 2
1344.3.d.b 4 8.d odd 2 1
1344.3.d.b 4 24.f even 2 1
1344.3.d.f 4 8.b even 2 1
1344.3.d.f 4 24.h odd 2 1

Hecke kernels

This newform subspace is the entire newspace \(S_{3}^{\mathrm{new}}(21, [\chi])\).

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( 1 - 2 T^{2} + 5 T^{4} - 32 T^{6} + 256 T^{8} \)
$3$ \( 1 + 2 T + 12 T^{2} + 18 T^{3} + 81 T^{4} \)
$5$ \( 1 - 44 T^{2} + 1034 T^{4} - 27500 T^{6} + 390625 T^{8} \)
$7$ \( ( 1 - 7 T^{2} )^{2} \)
$11$ \( 1 - 428 T^{2} + 74630 T^{4} - 6266348 T^{6} + 214358881 T^{8} \)
$13$ \( ( 1 + 18 T + 412 T^{2} + 3042 T^{3} + 28561 T^{4} )^{2} \)
$17$ \( 1 - 988 T^{2} + 407046 T^{4} - 82518748 T^{6} + 6975757441 T^{8} \)
$19$ \( ( 1 - 6 T + 556 T^{2} - 2166 T^{3} + 130321 T^{4} )^{2} \)
$23$ \( 1 - 1444 T^{2} + 980166 T^{4} - 404090404 T^{6} + 78310985281 T^{8} \)
$29$ \( 1 - 2972 T^{2} + 3611558 T^{4} - 2102039132 T^{6} + 500246412961 T^{8} \)
$31$ \( ( 1 - 68 T + 3050 T^{2} - 65348 T^{3} + 923521 T^{4} )^{2} \)
$37$ \( ( 1 - 8 T + 1382 T^{2} - 10952 T^{3} + 1874161 T^{4} )^{2} \)
$41$ \( 1 - 1292 T^{2} + 2832038 T^{4} - 3650883212 T^{6} + 7984925229121 T^{8} \)
$43$ \( ( 1 + 80 T + 5046 T^{2} + 147920 T^{3} + 3418801 T^{4} )^{2} \)
$47$ \( 1 - 6148 T^{2} + 19144326 T^{4} - 30000278788 T^{6} + 23811286661761 T^{8} \)
$53$ \( 1 + 20 T^{2} - 13350138 T^{4} + 157809620 T^{6} + 62259690411361 T^{8} \)
$59$ \( 1 - 3676 T^{2} + 15964266 T^{4} - 44543419036 T^{6} + 146830437604321 T^{8} \)
$61$ \( ( 1 + 78 T + 8620 T^{2} + 290238 T^{3} + 13845841 T^{4} )^{2} \)
$67$ \( ( 1 + 12 T + 8566 T^{2} + 53868 T^{3} + 20151121 T^{4} )^{2} \)
$71$ \( 1 - 10588 T^{2} + 78813510 T^{4} - 269058878428 T^{6} + 645753531245761 T^{8} \)
$73$ \( ( 1 + 16 T + 5990 T^{2} + 85264 T^{3} + 28398241 T^{4} )^{2} \)
$79$ \( ( 1 - 64 T + 4434 T^{2} - 399424 T^{3} + 38950081 T^{4} )^{2} \)
$83$ \( 1 - 13948 T^{2} + 141899946 T^{4} - 661948661308 T^{6} + 2252292232139041 T^{8} \)
$89$ \( 1 - 11468 T^{2} + 120945830 T^{4} - 719528019788 T^{6} + 3936588805702081 T^{8} \)
$97$ \( ( 1 + 4 T + 18374 T^{2} + 37636 T^{3} + 88529281 T^{4} )^{2} \)
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