Atlas › Modular forms › Weight 4 › Level 26 › 26.4.a › 26.4.a.c

Newform orbit 26.4.a.c

$q$ -expansion

$q + 2q^{2} + 4q^{3} + 4q^{4} - 18q^{5} + 8q^{6} + 20q^{7} + 8q^{8} - 11q^{9} - 36q^{10} - 48q^{11} + 16q^{12} + 13q^{13} + 40q^{14} - 72q^{15} + 16q^{16} + 66q^{17} - 22q^{18} - 16q^{19} - 72q^{20} + 80q^{21} - 96q^{22} + 168q^{23} + 32q^{24} + O(q^{25})$

Coefficient field

The coefficients $a_n$ generate $\mathbb{Q}$ . The eigenvalue of $T = T_{3} + 3T_{5}$ is a root of

$x + 50$

Atkin–Lehner signs

$p$	$w_p$
2	$-1$
13	$-1$

For $p \parallel N$ every form in the orbit has $a_p = -p^{k/2-1} w_p$ . The Fricke sign is $w_N = +1$ , so the sign of the functional equation is $(-1)^{k/2} w_N = +1$ : each L-function in the orbit has even analytic rank.

Traces of Hecke eigenvalues

$p$	2	3	5	7	11	13	17	19	23	29	31	37	41	43	47	53	59	61	67	71	73	79	83	89	97
$\operatorname{tr} a_p$	2	4	−18	20	−48	13	66	−16	168	6	20	254	−390	−124	−468	558	−96	−826	−160	−420	362	776	0	1626	−1294

$\operatorname{tr} a_n$ for every $n \le 1000$ is in the JSON.

Sato–Tate

The normalized $a_p / 2p^{3/2}$ for the primes $p < 1000$ not dividing 26, against the semicircle $\tfrac{2}{\pi}\sqrt{1 - x^2}$ :

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.1 s (one thread) and proven: the dimensions are certified, and the characteristic polynomial of $T$ over $\mathbb{Z}$ is reconstructed by CRT past a rigorous coefficient bound.

The engine's checks

dim M^+ at levels [1, 2, 13, 26]: [1, 2, 5, 13] (certified at ell = 2147483629)
T = [(3, 1), (5, 3)]; h of degree 3 = 1 x 3 (phi(ord eps) x dim S_k^new); 1 primes, 0 rejected

Open in the notebook · JSON · stored data

Recompute it yourself

In Sage mode at sagebrush.space (or npx sagebrush --sage):

newform_orbits(26, 4)[2]   # 26.4.a.c

With the Rust engine (source), in engine/:

cargo run --release -p sagebrush-web --example atlas -- 26:4 1000