Atlas › Modular forms › Weight 2 › Level 928 › 928.2.a › 928.2.a.h

Newform orbit 928.2.a.h

Trace form

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

$5q + 4q^{3} - 2q^{5} + 4q^{7} + 9q^{9} + 8q^{11} - 6q^{13} + 6q^{15} + 6q^{17} + 6q^{19} - 4q^{21} + 8q^{23} + O(q^{25})$

Coefficient field

The coefficients $a_n$ generate a number field of degree 5. It is generated by the eigenvalue $\alpha$ of $T = T_{3} + 2T_{5} + 3T_{7} + 4T_{11} + 5T_{13} + 6T_{17} + 7T_{19} + 8T_{23}$ , whose minimal polynomial is

$x^{5} - 156x^{4} + 5416x^{3} + 96216x^{2} - 3597416x - 21816272$

Atkin–Lehner signs

$p$	$w_p$
2	— ( $2^2 \mid 928$ )
29	$+1$

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	4	−2	4	8	−6	6	6	8	−5	8	−14	6	8	28	−14	16	−18	0	−4	2	−12	32	30	6

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.747 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, 8, 16, 29, 32, 58, 116, 232, 464, 928]: [0, 1, 2, 3, 4, 3, 6, 9, 18, 34, 64, 124] (certified at ell = 2147483353)
T = [(3, 1), (5, 2), (7, 3), (11, 4), (13, 5), (17, 6), (19, 7), (23, 8)]; h of degree 28 = 1 x 28 (phi(ord eps) x dim S_k^new); 8 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(928, 2)[7]   # 928.2.a.h

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

cargo run --release -p sagebrush-web --example atlas -- 928:2 1000