Properties

Label 2-21-7.4-c29-0-0
Degree $2$
Conductor $21$
Sign $-0.834 - 0.550i$
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  + (1.31e3 + 2.27e3i)2-s + (2.39e6 − 4.14e6i)3-s + (2.64e8 − 4.58e8i)4-s + (1.11e10 + 1.92e10i)5-s + 1.25e10·6-s + (−1.79e12 + 6.33e9i)7-s + 2.80e12·8-s + (−1.14e13 − 1.98e13i)9-s + (−2.92e13 + 5.06e13i)10-s + (−4.71e14 + 8.17e14i)11-s + (−1.26e15 − 2.19e15i)12-s + 1.71e16·13-s + (−2.37e15 − 4.07e15i)14-s + 1.06e17·15-s + (−1.38e17 − 2.40e17i)16-s + (−3.49e17 + 6.05e17i)17-s + ⋯
L(s)  = 1  + (0.0567 + 0.0982i)2-s + (0.288 − 0.499i)3-s + (0.493 − 0.854i)4-s + (0.815 + 1.41i)5-s + 0.0654·6-s + (−0.999 + 0.00352i)7-s + 0.225·8-s + (−0.166 − 0.288i)9-s + (−0.0925 + 0.160i)10-s + (−0.374 + 0.648i)11-s + (−0.284 − 0.493i)12-s + 1.20·13-s + (−0.0570 − 0.0980i)14-s + 0.941·15-s + (−0.480 − 0.832i)16-s + (−0.503 + 0.872i)17-s + ⋯

Functional equation

\[\begin{aligned}\Lambda(s)=\mathstrut & 21 ^{s/2} \, \Gamma_{\C}(s) \, L(s)\cr =\mathstrut & (-0.834 - 0.550i)\, \overline{\Lambda}(30-s) \end{aligned}\]
\[\begin{aligned}\Lambda(s)=\mathstrut & 21 ^{s/2} \, \Gamma_{\C}(s+29/2) \, L(s)\cr =\mathstrut & (-0.834 - 0.550i)\, \overline{\Lambda}(1-s) \end{aligned}\]

Invariants

Degree: \(2\)
Conductor: \(21\)    =    \(3 \cdot 7\)
Sign: $-0.834 - 0.550i$
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: \((2,\ 21,\ (\ :29/2),\ -0.834 - 0.550i)\)

Particular Values

\(L(15)\) \(\approx\) \(0.8202992211\)
\(L(\frac12)\) \(\approx\) \(0.8202992211\)
\(L(\frac{31}{2})\) 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 \( 1 + (1.79e12 - 6.33e9i)T \)
good2 \( 1 + (-1.31e3 - 2.27e3i)T + (-2.68e8 + 4.64e8i)T^{2} \)
5 \( 1 + (-1.11e10 - 1.92e10i)T + (-9.31e19 + 1.61e20i)T^{2} \)
11 \( 1 + (4.71e14 - 8.17e14i)T + (-7.93e29 - 1.37e30i)T^{2} \)
13 \( 1 - 1.71e16T + 2.01e32T^{2} \)
17 \( 1 + (3.49e17 - 6.05e17i)T + (-2.40e35 - 4.17e35i)T^{2} \)
19 \( 1 + (1.03e18 + 1.79e18i)T + (-6.06e36 + 1.05e37i)T^{2} \)
23 \( 1 + (-1.85e19 - 3.21e19i)T + (-1.54e39 + 2.67e39i)T^{2} \)
29 \( 1 + 1.53e21T + 2.56e42T^{2} \)
31 \( 1 + (6.47e20 - 1.12e21i)T + (-8.88e42 - 1.53e43i)T^{2} \)
37 \( 1 + (5.31e22 + 9.20e22i)T + (-1.50e45 + 2.60e45i)T^{2} \)
41 \( 1 + 1.82e23T + 5.89e46T^{2} \)
43 \( 1 + 5.69e23T + 2.34e47T^{2} \)
47 \( 1 + (-1.09e24 - 1.89e24i)T + (-1.54e48 + 2.68e48i)T^{2} \)
53 \( 1 + (4.51e24 - 7.82e24i)T + (-5.04e49 - 8.74e49i)T^{2} \)
59 \( 1 + (-2.28e25 + 3.96e25i)T + (-1.13e51 - 1.95e51i)T^{2} \)
61 \( 1 + (1.43e25 + 2.48e25i)T + (-2.97e51 + 5.15e51i)T^{2} \)
67 \( 1 + (-6.26e25 + 1.08e26i)T + (-4.52e52 - 7.82e52i)T^{2} \)
71 \( 1 + 1.13e26T + 4.85e53T^{2} \)
73 \( 1 + (6.80e26 - 1.17e27i)T + (-5.43e53 - 9.41e53i)T^{2} \)
79 \( 1 + (2.71e27 + 4.70e27i)T + (-5.37e54 + 9.30e54i)T^{2} \)
83 \( 1 + 2.75e27T + 4.50e55T^{2} \)
89 \( 1 + (-1.47e28 - 2.55e28i)T + (-1.70e56 + 2.95e56i)T^{2} \)
97 \( 1 - 1.60e28T + 4.13e57T^{2} \)
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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

−12.96972605786532011867821638012, −11.06686250890622573369052217854, −10.34304997518708493701322648367, −9.214370243386884398610495692250, −7.19283554503500167890765032432, −6.49613373407488719876813592433, −5.72073467212056389885229863843, −3.48693078296838688319856211122, −2.37458020633893683397352047266, −1.56886323374858585882498967906, 0.13671692349773247848895916917, 1.60092873866256686689821629951, 2.90900294732117201949548442185, 3.94020738747316706793703915077, 5.33490488363515792601216192009, 6.56421495485570658485584117658, 8.379039070797547880216261550232, 8.999430276609101442770329255295, 10.31721929362643975323378144202, 11.78998463261997712482781332938

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