Properties

Label 2-21-7.4-c29-0-8
Degree $2$
Conductor $21$
Sign $-0.644 - 0.764i$
Analytic cond. $111.883$
Root an. cond. $10.5775$
Motivic weight $29$
Arithmetic yes
Rational no
Primitive yes
Self-dual no
Analytic rank $0$

Origins

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Normalization:  

Dirichlet series

L(s)  = 1  + (3.93e3 + 6.82e3i)2-s + (−2.39e6 + 4.14e6i)3-s + (2.37e8 − 4.11e8i)4-s + (1.52e8 + 2.64e8i)5-s − 3.76e10·6-s + (1.72e12 + 5.01e11i)7-s + (7.96e12 + 0.000244i)8-s + (−1.14e13 − 1.98e13i)9-s + (−1.20e12 + 2.08e12i)10-s + (9.83e13 − 1.70e14i)11-s + (1.13e15 + 1.96e15i)12-s − 1.06e16·13-s + (3.36e15 + 1.37e16i)14-s − 1.46e15·15-s + (−9.60e16 − 1.66e17i)16-s + (−5.25e17 + 9.09e17i)17-s + ⋯
L(s)  = 1  + (0.169 + 0.294i)2-s + (−0.288 + 0.499i)3-s + (0.442 − 0.765i)4-s + (0.0112 + 0.0194i)5-s − 0.196·6-s + (0.960 + 0.279i)7-s + 0.640·8-s + (−0.166 − 0.288i)9-s + (−0.00380 + 0.00659i)10-s + (0.0780 − 0.135i)11-s + (0.255 + 0.442i)12-s − 0.748·13-s + (0.0808 + 0.330i)14-s − 0.0129·15-s + (−0.333 − 0.577i)16-s + (−0.756 + 1.31i)17-s + ⋯

Functional equation

\[\begin{aligned}\Lambda(s)=\mathstrut & 21 ^{s/2} \, \Gamma_{\C}(s) \, L(s)\cr =\mathstrut & (-0.644 - 0.764i)\, \overline{\Lambda}(30-s) \end{aligned}\]
\[\begin{aligned}\Lambda(s)=\mathstrut & 21 ^{s/2} \, \Gamma_{\C}(s+29/2) \, L(s)\cr =\mathstrut & (-0.644 - 0.764i)\, \overline{\Lambda}(1-s) \end{aligned}\]

Invariants

Degree: \(2\)
Conductor: \(21\)    =    \(3 \cdot 7\)
Sign: $-0.644 - 0.764i$
Analytic conductor: \(111.883\)
Root analytic conductor: \(10.5775\)
Motivic weight: \(29\)
Rational: no
Arithmetic: yes
Character: $\chi_{21} (4, \cdot )$
Primitive: yes
Self-dual: no
Analytic rank: \(0\)
Selberg data: \((2,\ 21,\ (\ :29/2),\ -0.644 - 0.764i)\)

Particular Values

\(L(15)\) \(\approx\) \(1.672562627\)
\(L(\frac12)\) \(\approx\) \(1.672562627\)
\(L(\frac{31}{2})\) not available
\(L(1)\) not available

Euler product

   \(L(s) = \displaystyle \prod_{p} F_p(p^{-s})^{-1} \)
$p$$F_p(T)$
bad3 \( 1 + (2.39e6 - 4.14e6i)T \)
7 \( 1 + (-1.72e12 - 5.01e11i)T \)
good2 \( 1 + (-3.93e3 - 6.82e3i)T + (-2.68e8 + 4.64e8i)T^{2} \)
5 \( 1 + (-1.52e8 - 2.64e8i)T + (-9.31e19 + 1.61e20i)T^{2} \)
11 \( 1 + (-9.83e13 + 1.70e14i)T + (-7.93e29 - 1.37e30i)T^{2} \)
13 \( 1 + 1.06e16T + 2.01e32T^{2} \)
17 \( 1 + (5.25e17 - 9.09e17i)T + (-2.40e35 - 4.17e35i)T^{2} \)
19 \( 1 + (-1.20e18 - 2.08e18i)T + (-6.06e36 + 1.05e37i)T^{2} \)
23 \( 1 + (7.87e18 + 1.36e19i)T + (-1.54e39 + 2.67e39i)T^{2} \)
29 \( 1 + 2.50e21T + 2.56e42T^{2} \)
31 \( 1 + (3.67e21 - 6.37e21i)T + (-8.88e42 - 1.53e43i)T^{2} \)
37 \( 1 + (3.97e21 + 6.88e21i)T + (-1.50e45 + 2.60e45i)T^{2} \)
41 \( 1 - 1.73e23T + 5.89e46T^{2} \)
43 \( 1 - 4.31e23T + 2.34e47T^{2} \)
47 \( 1 + (-1.17e24 - 2.02e24i)T + (-1.54e48 + 2.68e48i)T^{2} \)
53 \( 1 + (-2.60e24 + 4.52e24i)T + (-5.04e49 - 8.74e49i)T^{2} \)
59 \( 1 + (2.68e25 - 4.65e25i)T + (-1.13e51 - 1.95e51i)T^{2} \)
61 \( 1 + (9.55e24 + 1.65e25i)T + (-2.97e51 + 5.15e51i)T^{2} \)
67 \( 1 + (8.80e25 - 1.52e26i)T + (-4.52e52 - 7.82e52i)T^{2} \)
71 \( 1 - 9.89e25T + 4.85e53T^{2} \)
73 \( 1 + (-3.63e26 + 6.30e26i)T + (-5.43e53 - 9.41e53i)T^{2} \)
79 \( 1 + (-8.41e26 - 1.45e27i)T + (-5.37e54 + 9.30e54i)T^{2} \)
83 \( 1 + 1.14e28T + 4.50e55T^{2} \)
89 \( 1 + (1.10e27 + 1.90e27i)T + (-1.70e56 + 2.95e56i)T^{2} \)
97 \( 1 - 7.92e28T + 4.13e57T^{2} \)
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   \(L(s) = \displaystyle\prod_p \ \prod_{j=1}^{2} (1 - \alpha_{j,p}\, p^{-s})^{-1}\)

Imaginary part of the first few zeros on the critical line

−12.44078141075485286152455510496, −11.11695998315121631617300843927, −10.41554822048612929105169767177, −8.979061701201499281437470496773, −7.52054274402998329336187755403, −6.12808007451599522552218386137, −5.21443203790460424139842372272, −4.15608806742278825892386676497, −2.29206653491612724200442902427, −1.25436156686588498163899316473, 0.32147888934919252832372352399, 1.73992862939733450473358483112, 2.62102554019403121988972071138, 4.15409814769467473002840890196, 5.31281843586010662488182452915, 7.15777930536489398606690920959, 7.59094070762845226840560012900, 9.192674361867057364261353132150, 11.07886342964457555879538761026, 11.57276650860003227035179055861

Graph of the $Z$-function along the critical line