Atlas › Modular forms › Weight 2 › Level 724 › 724.2.a › 724.2.a.b

Newform orbit 724.2.a.b

Trace form

The 5 newforms in this orbit are conjugate over $\mathbb{Q}$ ; the sum of their $q$ -expansions is

$5q - q^{3} - 5q^{5} - 4q^{7} - 4q^{9} - 2q^{13} - 2q^{15} - 13q^{17} - 4q^{19} - 11q^{21} - 10q^{23} + O(q^{25})$

Coefficient field

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

$x^{5} + 6x^{4} + 5x^{3} - 9x^{2} - 5x + 3$

Atkin–Lehner signs

$p$	$w_p$
2	— ( $2^2 \mid 724$ )
181	$-1$

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	−1	−5	−4	0	−2	−13	−4	−10	−21	−9	−10	−22	9	4	−5	10	−4	3	−13	5	0	13	−5	17

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.22 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, 181, 362, 724]: [0, 1, 2, 15, 47, 94] (certified at ell = 2147482801)
T = [(3, 1), (5, 1)]; h of degree 15 = 1 x 15 (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(724, 2)[1]   # 724.2.a.b

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

cargo run --release -p sagebrush-web --example atlas -- 724:2 1000