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Properties

Label 2-21-21.20-c3-0-4
Degree $2$
Conductor $21$
Sign $0.149 + 0.988i$
Analytic cond. $1.23904$
Root an. cond. $1.11312$
Motivic weight $3$
Arithmetic yes
Rational no
Primitive yes
Self-dual no
Analytic rank $0$

Origins

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Normalization:  

Dirichlet series

L(s)  = 1  − 4.12i·2-s + (5.04 + 1.22i)3-s − 9·4-s − 10.0·5-s + (5.04 − 20.8i)6-s + (7 + 17.1i)7-s + 4.12i·8-s + (23.9 + 12.3i)9-s + 41.6i·10-s + 32.9i·11-s + (−45.4 − 11.0i)12-s − 56.3i·13-s + (70.6 − 28.8i)14-s + (−50.9 − 12.3i)15-s − 55·16-s − 60.5·17-s + ⋯
L(s)  = 1  − 1.45i·2-s + (0.971 + 0.235i)3-s − 1.12·4-s − 0.903·5-s + (0.343 − 1.41i)6-s + (0.377 + 0.925i)7-s + 0.182i·8-s + (0.888 + 0.458i)9-s + 1.31i·10-s + 0.904i·11-s + (−1.09 − 0.265i)12-s − 1.20i·13-s + (1.34 − 0.550i)14-s + (−0.877 − 0.212i)15-s − 0.859·16-s − 0.864·17-s + ⋯

Functional equation

\[\begin{aligned}\Lambda(s)=\mathstrut & 21 ^{s/2} \, \Gamma_{\C}(s) \, L(s)\cr =\mathstrut & (0.149 + 0.988i)\, \overline{\Lambda}(4-s) \end{aligned}\]
\[\begin{aligned}\Lambda(s)=\mathstrut & 21 ^{s/2} \, \Gamma_{\C}(s+3/2) \, L(s)\cr =\mathstrut & (0.149 + 0.988i)\, \overline{\Lambda}(1-s) \end{aligned}\]

Invariants

Degree: \(2\)
Conductor: \(21\)    =    \(3 \cdot 7\)
Sign: $0.149 + 0.988i$
Analytic conductor: \(1.23904\)
Root analytic conductor: \(1.11312\)
Motivic weight: \(3\)
Rational: no
Arithmetic: yes
Character: $\chi_{21} (20, \cdot )$
Primitive: yes
Self-dual: no
Analytic rank: \(0\)
Selberg data: \((2,\ 21,\ (\ :3/2),\ 0.149 + 0.988i)\)

Particular Values

\(L(2)\) \(\approx\) \(0.960418 - 0.826459i\)
\(L(\frac12)\) \(\approx\) \(0.960418 - 0.826459i\)
\(L(\frac{5}{2})\) not available
\(L(1)\) not available

Euler product

   \(L(s) = \displaystyle \prod_{p} F_p(p^{-s})^{-1} \)
$p$$F_p(T)$
bad3 \( 1 + (-5.04 - 1.22i)T \)
7 \( 1 + (-7 - 17.1i)T \)
good2 \( 1 + 4.12iT - 8T^{2} \)
5 \( 1 + 10.0T + 125T^{2} \)
11 \( 1 - 32.9iT - 1.33e3T^{2} \)
13 \( 1 + 56.3iT - 2.19e3T^{2} \)
17 \( 1 + 60.5T + 4.91e3T^{2} \)
19 \( 1 - 36.7iT - 6.85e3T^{2} \)
23 \( 1 + 90.7iT - 1.21e4T^{2} \)
29 \( 1 - 57.7iT - 2.43e4T^{2} \)
31 \( 1 + 254. iT - 2.97e4T^{2} \)
37 \( 1 - 230T + 5.06e4T^{2} \)
41 \( 1 - 141.T + 6.89e4T^{2} \)
43 \( 1 - 44T + 7.95e4T^{2} \)
47 \( 1 - 343.T + 1.03e5T^{2} \)
53 \( 1 - 206. iT - 1.48e5T^{2} \)
59 \( 1 + 131.T + 2.05e5T^{2} \)
61 \( 1 - 71.0iT - 2.26e5T^{2} \)
67 \( 1 + 64T + 3.00e5T^{2} \)
71 \( 1 + 461. iT - 3.57e5T^{2} \)
73 \( 1 - 88.1iT - 3.89e5T^{2} \)
79 \( 1 + 442T + 4.93e5T^{2} \)
83 \( 1 - 494.T + 5.71e5T^{2} \)
89 \( 1 - 484.T + 7.04e5T^{2} \)
97 \( 1 - 1.09e3iT - 9.12e5T^{2} \)
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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

−18.09372361885521620780770118884, −15.67888396905776900232896273720, −14.89572050527322335853072821761, −13.04970478817152439150133503826, −12.10185213718704110317220700395, −10.71122465500148351413525987822, −9.324080705887293607891889333454, −7.912000685252542662375479189858, −4.25110069166822848048650606589, −2.50041469302151453672513236121, 4.21846996750222375127956771415, 6.82973460345722134832736390116, 7.83455932287817335780675760359, 8.956709544708354989406186761080, 11.34292367802797560617698743003, 13.53977659577977441681503024592, 14.27873970063235057893323661514, 15.50183068191236344962823948992, 16.35541835297757840792458956604, 17.71732497355872684812138047607

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