Properties

Label 2-21-1.1-c5-0-3
Degree $2$
Conductor $21$
Sign $-1$
Analytic cond. $3.36806$
Root an. cond. $1.83522$
Motivic weight $5$
Arithmetic yes
Rational yes
Primitive yes
Self-dual yes
Analytic rank $1$

Origins

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Normalization:  

Dirichlet series

L(s)  = 1  + 2-s − 9·3-s − 31·4-s − 34·5-s − 9·6-s − 49·7-s − 63·8-s + 81·9-s − 34·10-s − 340·11-s + 279·12-s + 454·13-s − 49·14-s + 306·15-s + 929·16-s − 798·17-s + 81·18-s + 892·19-s + 1.05e3·20-s + 441·21-s − 340·22-s − 3.19e3·23-s + 567·24-s − 1.96e3·25-s + 454·26-s − 729·27-s + 1.51e3·28-s + ⋯
L(s)  = 1  + 0.176·2-s − 0.577·3-s − 0.968·4-s − 0.608·5-s − 0.102·6-s − 0.377·7-s − 0.348·8-s + 1/3·9-s − 0.107·10-s − 0.847·11-s + 0.559·12-s + 0.745·13-s − 0.0668·14-s + 0.351·15-s + 0.907·16-s − 0.669·17-s + 0.0589·18-s + 0.566·19-s + 0.589·20-s + 0.218·21-s − 0.149·22-s − 1.25·23-s + 0.200·24-s − 0.630·25-s + 0.131·26-s − 0.192·27-s + 0.366·28-s + ⋯

Functional equation

\[\begin{aligned}\Lambda(s)=\mathstrut & 21 ^{s/2} \, \Gamma_{\C}(s) \, L(s)\cr =\mathstrut & -\, \Lambda(6-s) \end{aligned}\]
\[\begin{aligned}\Lambda(s)=\mathstrut & 21 ^{s/2} \, \Gamma_{\C}(s+5/2) \, L(s)\cr =\mathstrut & -\, \Lambda(1-s) \end{aligned}\]

Invariants

Degree: \(2\)
Conductor: \(21\)    =    \(3 \cdot 7\)
Sign: $-1$
Analytic conductor: \(3.36806\)
Root analytic conductor: \(1.83522\)
Motivic weight: \(5\)
Rational: yes
Arithmetic: yes
Character: Trivial
Primitive: yes
Self-dual: yes
Analytic rank: \(1\)
Selberg data: \((2,\ 21,\ (\ :5/2),\ -1)\)

Particular Values

\(L(3)\) \(=\) \(0\)
\(L(\frac12)\) \(=\) \(0\)
\(L(\frac{7}{2})\) not available
\(L(1)\) not available

Euler product

   \(L(s) = \displaystyle \prod_{p} F_p(p^{-s})^{-1} \)
$p$$F_p(T)$
bad3 \( 1 + p^{2} T \)
7 \( 1 + p^{2} T \)
good2 \( 1 - T + p^{5} T^{2} \)
5 \( 1 + 34 T + p^{5} T^{2} \)
11 \( 1 + 340 T + p^{5} T^{2} \)
13 \( 1 - 454 T + p^{5} T^{2} \)
17 \( 1 + 798 T + p^{5} T^{2} \)
19 \( 1 - 892 T + p^{5} T^{2} \)
23 \( 1 + 3192 T + p^{5} T^{2} \)
29 \( 1 + 8242 T + p^{5} T^{2} \)
31 \( 1 + 2496 T + p^{5} T^{2} \)
37 \( 1 - 9798 T + p^{5} T^{2} \)
41 \( 1 - 19834 T + p^{5} T^{2} \)
43 \( 1 + 17236 T + p^{5} T^{2} \)
47 \( 1 - 8928 T + p^{5} T^{2} \)
53 \( 1 - 150 T + p^{5} T^{2} \)
59 \( 1 + 42396 T + p^{5} T^{2} \)
61 \( 1 - 14758 T + p^{5} T^{2} \)
67 \( 1 + 1676 T + p^{5} T^{2} \)
71 \( 1 - 14568 T + p^{5} T^{2} \)
73 \( 1 - 78378 T + p^{5} T^{2} \)
79 \( 1 + 2272 T + p^{5} T^{2} \)
83 \( 1 + 37764 T + p^{5} T^{2} \)
89 \( 1 + 117286 T + p^{5} T^{2} \)
97 \( 1 - 10002 T + p^{5} T^{2} \)
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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

−16.42838682295360959062966332225, −15.33216633212325923755708322977, −13.64937104902993248859833464059, −12.63565727830355611493095022722, −11.15076671357130659061177396747, −9.559142676085913900520360107007, −7.88096433507024607788982289933, −5.73242448063279756033617294087, −3.99730846216034146478381460190, 0, 3.99730846216034146478381460190, 5.73242448063279756033617294087, 7.88096433507024607788982289933, 9.559142676085913900520360107007, 11.15076671357130659061177396747, 12.63565727830355611493095022722, 13.64937104902993248859833464059, 15.33216633212325923755708322977, 16.42838682295360959062966332225

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