Atlas › Modular forms › Weight 2 › Level 938 › 938.2.a › 938.2.a.j

Newform orbit 938.2.a.j

Trace form

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

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

Coefficient field

The coefficients $a_n$ generate a number field of degree 7. It is generated by the eigenvalue $\alpha$ of $T = T_{3} + 3T_{5} + 5T_{11} + 7T_{13} + 9T_{17}$ , whose minimal polynomial is

$x^{7} + 7x^{6} - 7150x^{5} - 64019x^{4} + 11212626x^{3} + 220710390x^{2} - 51845712x - 12409118104$

Atkin–Lehner signs

$p$	$w_p$
2	$-1$
7	$-1$
67	$-1$

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
$\operatorname{tr} a_p$	7	−1	1	7	5	−1	−3	2	11	20	−2	16	−4	21	5	13	−12	11	7	−5	21	16	−40	−39	18

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.51 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, 2, 7, 14, 67, 134, 469, 938]: [0, 1, 1, 4, 6, 19, 46, 140] (certified at ell = 2147483647)
T = [(3, 1), (5, 3), (11, 5), (13, 7), (17, 9)]; h of degree 33 = 1 x 33 (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(938, 2)[9]   # 938.2.a.j

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

cargo run --release -p sagebrush-web --example atlas -- 938:2 1000