Atlas › Modular forms › Weight 4 › Level 124 › 124.4.a › 124.4.a.b

Newform orbit 124.4.a.b

Trace form

The 4 newforms in this orbit are conjugate over $\mathbb{Q}$ ; the sum of their $q$ -expansions is

$4q + 2q^{3} + 6q^{5} + 16q^{7} + 64q^{9} + 96q^{11} + 42q^{13} + 182q^{15} - 2q^{17} + 180q^{19} + 150q^{21} + 142q^{23} + O(q^{25})$

Coefficient field

The coefficients $a_n$ generate a number field of degree 4. It is generated by the eigenvalue $\alpha$ of $T = T_{3} + T_{5}$ , whose minimal polynomial is

$x^{4} - 8x^{3} - 561x^{2} + 2864x + 1196$

Atkin–Lehner signs

$p$	$w_p$
2	— ( $2^2 \mid 124$ )
31	$-1$

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	2	6	16	96	42	−2	180	142	262	124	−284	−526	−326	468	−252	−164	−1066	0	1504	−732	822	1408	250	526

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.11 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, 4, 31, 62, 124]: [1, 2, 3, 9, 26, 51] (certified at ell = 2147482951)
T = [(3, 1), (5, 1)]; h of degree 8 = 1 x 8 (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(124, 4)[1]   # 124.4.a.b

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

cargo run --release -p sagebrush-web --example atlas -- 124:4 1000