Atlas › Modular forms › Weight 2 › Level 397 › 397.2.a › 397.2.a.c

Newform orbit 397.2.a.c

Trace form

The 5 newforms in this orbit are conjugate over $\mathbb{Q}$ ; the sum of their $q$ -expansions is

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

Coefficient field

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

$x^{5} - 15x^{4} - 6x^{3} + 658x^{2} - 779x - 3475$

Atkin–Lehner signs

$p$	$w_p$
397	$-1$

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
$\operatorname{tr} a_p$	0	5	−2	1	6	2	20	−9	1	7	20	−3	3	1	2	14	16	22	17	9	9	−7	21	−20	24

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.186 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, 397]: [0, 33] (certified at ell = 2147483053)
T = [(2, 1), (3, 3)]; h of degree 32 = 1 x 32 (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(397, 2)[2]   # 397.2.a.c

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

cargo run --release -p sagebrush-web --example atlas -- 397:2 1000