Atlas › Modular forms › Weight 2 › Level 764 › 764.2.a › 764.2.a.b

Newform orbit 764.2.a.b

Trace form

The 8 newforms in this orbit are conjugate over $\mathbb{Q}$ ; the sum of their $q$ -expansions is

$8q + 3q^{3} + 5q^{7} + 5q^{9} + 3q^{11} + 10q^{13} + 11q^{15} - q^{17} + 24q^{19} + 7q^{21} + 8q^{23} + O(q^{25})$

Coefficient field

The coefficients $a_n$ generate a number field of degree 8. It is generated by the eigenvalue $\alpha$ of $T = T_{3} + T_{5}$ , whose minimal polynomial is

$x^{8} - 3x^{7} - 44x^{6} + 113x^{5} + 523x^{4} - 1022x^{3} - 1753x^{2} + 1547x - 289$

Atkin–Lehner signs

$p$	$w_p$
2	— ( $2^2 \mid 764$ )
191	$+1$

For $p \parallel N$ every form in the orbit has $a_p = -p^{k/2-1} w_p$ .

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
$\operatorname{tr} a_p$	0	3	0	5	3	10	−1	24	8	8	23	8	−4	15	9	−5	1	18	13	13	−22	19	10	−22	−15

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.222 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 label, dimension and $\operatorname{tr} a_p$ for every $p < 1000$ equal LMFDB's.

The engine's checks

dim M^+ at levels [1, 2, 4, 191, 382, 764]: [0, 1, 2, 17, 50, 99] (certified at ell = 2147483171)
T = [(3, 1), (5, 1)]; h of degree 16 = 1 x 16 (phi(ord eps) x dim S_k^new); 2 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(764, 2)[1]   # 764.2.a.b

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

cargo run --release -p sagebrush-web --example atlas -- 764:2 1000