Atlas › Modular forms › Weight 2 › Level 961 › 961.2.a › 961.2.a.a

Newform orbit 961.2.a.a

Trace form

The 2 newforms in this orbit are conjugate over $\mathbb{Q}$ ; the sum of their $q$ -expansions is

$2q - 2q^{2} - 2q^{3} + 2q^{4} + 2q^{5} + 6q^{6} + 2q^{7} - 6q^{8} - 2q^{10} - 2q^{11} - 10q^{12} - 2q^{13} - 6q^{14} - 2q^{15} + 6q^{16} - 6q^{17} - 8q^{18} + 6q^{19} + 2q^{20} - 6q^{21} + 14q^{22} - 8q^{23} + 10q^{24} + O(q^{25})$

Coefficient field

The coefficients $a_n$ generate $\mathbb{Q}(\sqrt{2})$ . It is generated by the eigenvalue $\alpha$ of $T = T_{2} + 3T_{3}$ , whose minimal polynomial is

$x^{2} + 8x - 16$

Atkin–Lehner signs

$p$	$w_p$
31	— ( $31^2 \mid 961$ )

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
$\operatorname{tr} a_p$	−2	−2	2	2	−2	−2	−6	6	−8	−8	0	2	2	−2	8	6	−6	0	−2	−14	2	−22	−6	−8	16

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.264 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, 31, 961]: [0, 3, 83] (certified at ell = 2147477881)
T = [(2, 1), (3, 3)]; h of degree 63 = 1 x 63 (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(961, 2)[0]   # 961.2.a.a

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

cargo run --release -p sagebrush-web --example atlas -- 961:2 1000