Properties

Degree 2
Conductor $ 2^{4} \cdot 7^{2} $
Sign $-1$
Motivic weight 1
Primitive yes
Self-dual yes
Analytic rank 1

Origins

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Normalization:  

Dirichlet series

L(s)  = 1  − 2·3-s + 9-s + 4·13-s − 6·17-s + 2·19-s − 5·25-s + 4·27-s − 6·29-s − 4·31-s + 2·37-s − 8·39-s − 6·41-s − 8·43-s − 12·47-s + 12·51-s + 6·53-s − 4·57-s − 6·59-s − 8·61-s + 4·67-s − 2·73-s + 10·75-s − 8·79-s − 11·81-s − 6·83-s + 12·87-s + 6·89-s + ⋯
L(s)  = 1  − 1.15·3-s + 1/3·9-s + 1.10·13-s − 1.45·17-s + 0.458·19-s − 25-s + 0.769·27-s − 1.11·29-s − 0.718·31-s + 0.328·37-s − 1.28·39-s − 0.937·41-s − 1.21·43-s − 1.75·47-s + 1.68·51-s + 0.824·53-s − 0.529·57-s − 0.781·59-s − 1.02·61-s + 0.488·67-s − 0.234·73-s + 1.15·75-s − 0.900·79-s − 1.22·81-s − 0.658·83-s + 1.28·87-s + 0.635·89-s + ⋯

Functional equation

\[\begin{aligned}\Lambda(s)=\mathstrut & 784 ^{s/2} \, \Gamma_{\C}(s) \, L(s)\cr =\mathstrut & -\, \Lambda(2-s) \end{aligned}\]
\[\begin{aligned}\Lambda(s)=\mathstrut & 784 ^{s/2} \, \Gamma_{\C}(s+1/2) \, L(s)\cr =\mathstrut & -\, \Lambda(1-s) \end{aligned}\]

Invariants

\( d \)  =  \(2\)
\( N \)  =  \(784\)    =    \(2^{4} \cdot 7^{2}\)
\( \varepsilon \)  =  $-1$
motivic weight  =  \(1\)
character  :  $\chi_{784} (1, \cdot )$
primitive  :  yes
self-dual  :  yes
analytic rank  =  1
Selberg data  =  $(2,\ 784,\ (\ :1/2),\ -1)$
$L(1)$  $=$  $0$
$L(\frac12)$  $=$  $0$
$L(\frac{3}{2})$   not available
$L(1)$   not available

Euler product

\[L(s) = \prod_{p \text{ prime}} F_p(p^{-s})^{-1} \]where, for $p \notin \{2,\;7\}$,\[F_p(T) = 1 - a_p T + p T^2 .\]If $p \in \{2,\;7\}$, then $F_p(T)$ is a polynomial of degree at most 1.
$p$$F_p(T)$
bad2 \( 1 \)
7 \( 1 \)
good3 \( 1 + 2 T + p T^{2} \)
5 \( 1 + p T^{2} \)
11 \( 1 + p T^{2} \)
13 \( 1 - 4 T + p T^{2} \)
17 \( 1 + 6 T + p T^{2} \)
19 \( 1 - 2 T + p T^{2} \)
23 \( 1 + p T^{2} \)
29 \( 1 + 6 T + p T^{2} \)
31 \( 1 + 4 T + p T^{2} \)
37 \( 1 - 2 T + p T^{2} \)
41 \( 1 + 6 T + p T^{2} \)
43 \( 1 + 8 T + p T^{2} \)
47 \( 1 + 12 T + p T^{2} \)
53 \( 1 - 6 T + p T^{2} \)
59 \( 1 + 6 T + p T^{2} \)
61 \( 1 + 8 T + p T^{2} \)
67 \( 1 - 4 T + p T^{2} \)
71 \( 1 + p T^{2} \)
73 \( 1 + 2 T + p T^{2} \)
79 \( 1 + 8 T + p T^{2} \)
83 \( 1 + 6 T + p T^{2} \)
89 \( 1 - 6 T + p T^{2} \)
97 \( 1 - 10 T + p T^{2} \)
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\[\begin{aligned}L(s) = \prod_p \ \prod_{j=1}^{2} (1 - \alpha_{j,p}\, p^{-s})^{-1}\end{aligned}\]

Imaginary part of the first few zeros on the critical line

−10.02053664953109744946236323249, −9.044637307272642732451675861332, −8.199638847074308569053560326614, −7.01851678171449461328017406897, −6.24500065333065006116855945568, −5.53331414913354333592453982899, −4.55372588498345584946220609716, −3.42554077807776045337947490220, −1.73289286183865826039844070287, 0, 1.73289286183865826039844070287, 3.42554077807776045337947490220, 4.55372588498345584946220609716, 5.53331414913354333592453982899, 6.24500065333065006116855945568, 7.01851678171449461328017406897, 8.199638847074308569053560326614, 9.044637307272642732451675861332, 10.02053664953109744946236323249

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