Atlas › Modular forms › Weight 4 › Level 66 › 66.4.a › 66.4.a.b

Newform orbit 66.4.a.b

$q$ -expansion

$q + 2q^{2} - 3q^{3} + 4q^{4} + 10q^{5} - 6q^{6} + 16q^{7} + 8q^{8} + 9q^{9} + 20q^{10} + 11q^{11} - 12q^{12} + 10q^{13} + 32q^{14} - 30q^{15} + 16q^{16} - 10q^{17} + 18q^{18} - 144q^{19} + 40q^{20} - 48q^{21} + 22q^{22} - 84q^{23} - 24q^{24} + O(q^{25})$

Coefficient field

The coefficients $a_n$ generate $\mathbb{Q}$ . The eigenvalue of $T = T_{5} + T_{7}$ is a root of

$x - 26$

Atkin–Lehner signs

$p$	$w_p$
2	$-1$
3	$+1$
11	$-1$

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	−3	10	16	11	10	−10	−144	−84	218	−176	46	−26	−488	404	194	444	202	−84	−764	354	1312	−1252	−1222	−1358

$\operatorname{tr} a_n$ 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 66, against the semicircle $\tfrac{2}{\pi}\sqrt{1 - x^2}$ :

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.113 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, 3, 6, 11, 22, 33, 66]: [1, 2, 2, 5, 4, 11, 14, 40] (certified at ell = 2147483171)
T = [(5, 1), (7, 1)]; h of degree 4 = 1 x 4 (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(66, 4)[1]   # 66.4.a.b

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

cargo run --release -p sagebrush-web --example atlas -- 66:4 1000