Atlas › Modular forms › Weight 2 › Level 891 › 891.2.a › 891.2.a.q

Newform orbit 891.2.a.q

Trace form

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

$4q + q^{2} + 11q^{4} + 4q^{5} + q^{7} + q^{10} + 4q^{11} + 7q^{13} + q^{14} + 17q^{16} - 5q^{17} + 9q^{19} - 10q^{20} + q^{22} + 14q^{23} + O(q^{25})$

Coefficient field

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

$x^{4} - 67x^{3} - 1122x^{2} + 112385x - 979670$

Atkin–Lehner signs

$p$	$w_p$
3	— ( $3^2 \mid 891$ )
11	$-1$

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
$\operatorname{tr} a_p$	1	0	4	1	4	7	−5	9	14	−6	−2	3	−2	−21	−7	−6	2	15	14	−3	22	11	18	−6	26

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.406 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, 3, 9, 11, 27, 33, 81, 99, 297, 891]: [0, 1, 2, 2, 4, 6, 10, 14, 38, 110] (certified at ell = 2147482801)
T = [(2, 1), (5, 3), (7, 5), (13, 7)]; h of degree 40 = 1 x 40 (phi(ord eps) x dim S_k^new); 9 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(891, 2)[16]   # 891.2.a.q

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

cargo run --release -p sagebrush-web --example atlas -- 891:2 1000