Atlas › Modular forms › Weight 2 › Level 754 › 754.2.a › 754.2.a.h

Newform orbit 754.2.a.h

Trace form

The 4 newforms in this orbit are conjugate over $\mathbb{Q}$ ; the sum of their $q$ -expansions is

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

Coefficient field

The coefficients $a_n$ generate a number field of degree 4. It is generated by the eigenvalue $\alpha$ of $T = T_{3} + 2T_{5} + 3T_{7} + 4T_{11} + 5T_{17} + 6T_{19} + 7T_{23} + 8T_{31}$ , whose minimal polynomial is

$x^{4} + 278x^{3} + 21797x^{2} + 224740x - 20161444$

Atkin–Lehner signs

$p$	$w_p$
2	$+1$
13	$+1$
29	$+1$

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 odd 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	2	−2	−2	−12	−4	2	−4	−16	−4	−12	−2	−20	2	−10	−8	4	−4	0	−18	−4	0	−8	−12	−4

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.506 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, 13, 26, 29, 58, 377, 754]: [0, 1, 1, 5, 3, 9, 36, 108] (certified at ell = 2147483353)
T = [(3, 1), (5, 2), (7, 3), (11, 4), (17, 5), (19, 6), (23, 7), (31, 8)]; h of degree 27 = 1 x 27 (phi(ord eps) x dim S_k^new); 8 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(754, 2)[7]   # 754.2.a.h

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

cargo run --release -p sagebrush-web --example atlas -- 754:2 1000