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

Newform orbit 246.4.a.f

Trace form

The 3 newforms in this orbit are conjugate over $\mathbb{Q}$ ; the sum of their $q$ -expansions is

$3q + 6q^{2} - 9q^{3} + 12q^{4} - q^{5} - 18q^{6} - 2q^{7} + 24q^{8} + 27q^{9} - 2q^{10} + 48q^{11} - 36q^{12} + 77q^{13} - 4q^{14} + 3q^{15} + 48q^{16} + 75q^{17} + 54q^{18} + 157q^{19} - 4q^{20} + 6q^{21} + 96q^{22} + 346q^{23} - 72q^{24} + O(q^{25})$

Coefficient field

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

$x^{3} + 7x^{2} - 5320x + 136904$

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
$\operatorname{tr} a_p$	6	−9	−1	−2	48	77	75	157	346	198	447	−392	123	−10	694	−118	−47	476	−137	−667	−917	−1424	969	−267	−1042

$\operatorname{tr} a_n$ 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)[5]   # 246.4.a.f

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

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