Properties

Label 2-21-1.1-c9-0-5
Degree $2$
Conductor $21$
Sign $-1$
Analytic cond. $10.8157$
Root an. cond. $3.28873$
Motivic weight $9$
Arithmetic yes
Rational yes
Primitive yes
Self-dual yes
Analytic rank $1$

Origins

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Normalization:  

Dirichlet series

L(s)  = 1  − 24·2-s + 81·3-s + 64·4-s − 144·5-s − 1.94e3·6-s + 2.40e3·7-s + 1.07e4·8-s + 6.56e3·9-s + 3.45e3·10-s − 1.50e4·11-s + 5.18e3·12-s − 1.51e5·13-s − 5.76e4·14-s − 1.16e4·15-s − 2.90e5·16-s − 3.50e5·17-s − 1.57e5·18-s − 6.91e5·19-s − 9.21e3·20-s + 1.94e5·21-s + 3.60e5·22-s + 8.92e5·23-s + 8.70e5·24-s − 1.93e6·25-s + 3.63e6·26-s + 5.31e5·27-s + 1.53e5·28-s + ⋯
L(s)  = 1  − 1.06·2-s + 0.577·3-s + 1/8·4-s − 0.103·5-s − 0.612·6-s + 0.377·7-s + 0.928·8-s + 1/3·9-s + 0.109·10-s − 0.309·11-s + 0.0721·12-s − 1.47·13-s − 0.400·14-s − 0.0594·15-s − 1.10·16-s − 1.01·17-s − 0.353·18-s − 1.21·19-s − 0.0128·20-s + 0.218·21-s + 0.328·22-s + 0.664·23-s + 0.535·24-s − 0.989·25-s + 1.56·26-s + 0.192·27-s + 0.0472·28-s + ⋯

Functional equation

\[\begin{aligned}\Lambda(s)=\mathstrut & 21 ^{s/2} \, \Gamma_{\C}(s) \, L(s)\cr =\mathstrut & -\, \Lambda(10-s) \end{aligned}\]
\[\begin{aligned}\Lambda(s)=\mathstrut & 21 ^{s/2} \, \Gamma_{\C}(s+9/2) \, L(s)\cr =\mathstrut & -\, \Lambda(1-s) \end{aligned}\]

Invariants

Degree: \(2\)
Conductor: \(21\)    =    \(3 \cdot 7\)
Sign: $-1$
Analytic conductor: \(10.8157\)
Root analytic conductor: \(3.28873\)
Motivic weight: \(9\)
Rational: yes
Arithmetic: yes
Character: Trivial
Primitive: yes
Self-dual: yes
Analytic rank: \(1\)
Selberg data: \((2,\ 21,\ (\ :9/2),\ -1)\)

Particular Values

\(L(5)\) \(=\) \(0\)
\(L(\frac12)\) \(=\) \(0\)
\(L(\frac{11}{2})\) not available
\(L(1)\) not available

Euler product

   \(L(s) = \displaystyle \prod_{p} F_p(p^{-s})^{-1} \)
$p$$F_p(T)$
bad3 \( 1 - p^{4} T \)
7 \( 1 - p^{4} T \)
good2 \( 1 + 3 p^{3} T + p^{9} T^{2} \)
5 \( 1 + 144 T + p^{9} T^{2} \)
11 \( 1 + 15030 T + p^{9} T^{2} \)
13 \( 1 + 151486 T + p^{9} T^{2} \)
17 \( 1 + 350448 T + p^{9} T^{2} \)
19 \( 1 + 691108 T + p^{9} T^{2} \)
23 \( 1 - 892458 T + p^{9} T^{2} \)
29 \( 1 - 1648518 T + p^{9} T^{2} \)
31 \( 1 + 3734296 T + p^{9} T^{2} \)
37 \( 1 + 11471902 T + p^{9} T^{2} \)
41 \( 1 - 13985724 T + p^{9} T^{2} \)
43 \( 1 - 16794524 T + p^{9} T^{2} \)
47 \( 1 + 14012052 T + p^{9} T^{2} \)
53 \( 1 + 97439910 T + p^{9} T^{2} \)
59 \( 1 - 110798304 T + p^{9} T^{2} \)
61 \( 1 + 93816682 T + p^{9} T^{2} \)
67 \( 1 + 122446456 T + p^{9} T^{2} \)
71 \( 1 - 206197398 T + p^{9} T^{2} \)
73 \( 1 - 250337558 T + p^{9} T^{2} \)
79 \( 1 + 38314852 T + p^{9} T^{2} \)
83 \( 1 + 514086924 T + p^{9} T^{2} \)
89 \( 1 + 1061294916 T + p^{9} T^{2} \)
97 \( 1 + 73841578 T + p^{9} T^{2} \)
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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

−15.48607158978069518914120794096, −14.20618675043846378235634351190, −12.79198752602841770933342871347, −10.89600158903245920928066823991, −9.605955238251057207401876588462, −8.448328542488532790545873205311, −7.26239420724494437041848791891, −4.57686365118691623409371195264, −2.09925926393890646695166835056, 0, 2.09925926393890646695166835056, 4.57686365118691623409371195264, 7.26239420724494437041848791891, 8.448328542488532790545873205311, 9.605955238251057207401876588462, 10.89600158903245920928066823991, 12.79198752602841770933342871347, 14.20618675043846378235634351190, 15.48607158978069518914120794096

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