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

Newform orbit 26.4.a.b

$q$ -expansion

$q + 2q^{2} - q^{3} + 4q^{4} + 17q^{5} - 2q^{6} - 35q^{7} + 8q^{8} - 26q^{9} + 34q^{10} + 2q^{11} - 4q^{12} + 13q^{13} - 70q^{14} - 17q^{15} + 16q^{16} - 19q^{17} - 52q^{18} + 94q^{19} + 68q^{20} + 35q^{21} + 4q^{22} - 72q^{23} - 8q^{24} + O(q^{25})$

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	−1	17	−35	2	13	−19	94	−72	246	−100	−11	−280	241	137	−232	−386	64	−670	55	−838	1016	420	−934	−1154

$\operatorname{tr} a_n$ 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)[1]   # 26.4.a.b

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

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