Atlas › Modular forms › Weight 2 › Level 305 › 305.2.a › 305.2.a.c

Newform orbit 305.2.a.c

Trace form

The 7 newforms in this orbit are conjugate over $\mathbb{Q}$ ; the sum of their $q$ -expansions is

$7q - 2q^{2} + 12q^{4} - 7q^{5} + 12q^{7} - 9q^{8} + 9q^{9} + 2q^{10} + 2q^{11} + 7q^{12} + 9q^{13} + 8q^{14} + 14q^{16} - 4q^{17} - 3q^{18} + 13q^{19} - 12q^{20} + 2q^{21} - 19q^{22} - 5q^{23} + 2q^{24} + O(q^{25})$

Coefficient field

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

$x^{7} + 2x^{6} - 146x^{5} - 148x^{4} + 6089x^{3} - 2766x^{2} - 69688x + 91272$

Atkin–Lehner signs

$p$	$w_p$
5	$+1$
61	$-1$

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
$\operatorname{tr} a_p$	−2	0	−7	12	2	9	−4	13	−5	7	35	9	−8	9	−3	−5	6	7	−11	19	4	3	10	14	20

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.185 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, 5, 61, 305]: [0, 1, 5, 32] (certified at ell = 2147482921)
T = [(2, 1), (3, 3)]; h of degree 21 = 1 x 21 (phi(ord eps) x dim S_k^new); 3 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(305, 2)[2]   # 305.2.a.c

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

cargo run --release -p sagebrush-web --example atlas -- 305:2 1000