Atlas › Modular forms › Weight 4 › Level 246 › 246.4.a › 246.4.a.c

Newform orbit 246.4.a.c

Trace form

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

$2q - 4q^{2} - 6q^{3} + 8q^{4} + q^{5} + 12q^{6} + 4q^{7} - 16q^{8} + 18q^{9} - 2q^{10} + 31q^{11} - 24q^{12} - 109q^{13} - 8q^{14} - 3q^{15} + 32q^{16} + 64q^{17} - 36q^{18} - 51q^{19} + 4q^{20} - 12q^{21} - 62q^{22} - 20q^{23} + 48q^{24} + O(q^{25})$

Coefficient field

The coefficients $a_n$ generate $\mathbb{Q}(\sqrt{57})$ . It is generated by the eigenvalue $\alpha$ of $T = T_{5} + 3T_{7}$ , whose minimal polynomial is

$x^{2} - 13x - 10346$

Atkin–Lehner signs

$p$	$w_p$
2	$+1$
3	$+1$
41	$+1$

For $p \parallel N$ every form in the orbit has $a_p = -p^{k/2-1} w_p$ . The Fricke sign is $w_N = +1$ , so the sign of the functional equation is $(-1)^{k/2} w_N = +1$ : each L-function in the orbit has even analytic rank.

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
$\operatorname{tr} a_p$	−4	−6	1	4	31	−109	64	−51	−20	387	38	115	−82	−15	391	1004	1007	599	−1915	−1150	38	−514	99	565	−618

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.227 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, 3, 6, 41, 82, 123, 246]: [1, 2, 2, 5, 12, 34, 44, 130] (certified at ell = 2147482921)
T = [(5, 1), (7, 3)]; h of degree 20 = 1 x 20 (phi(ord eps) x dim S_k^new); 5 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(246, 4)[2]   # 246.4.a.c

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

cargo run --release -p sagebrush-web --example atlas -- 246:4 1000