Atlas › Modular forms › Weight 2 › Level 838 › 838.2.a › 838.2.a.c

Newform orbit 838.2.a.c

Trace form

The 9 newforms in this orbit are conjugate over $\mathbb{Q}$ ; the sum of their $q$ -expansions is

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

Coefficient field

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

$x^{9} + 10x^{8} + 13x^{7} - 90x^{6} - 105x^{5} + 272x^{4} + 89x^{3} - 204x^{2} - 9x + 37$

Atkin–Lehner signs

$p$	$w_p$
2	$+1$
419	$+1$

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
$\operatorname{tr} a_p$	−9	−2	−8	0	−7	−8	−14	10	−20	−26	0	−21	−8	−8	−32	−32	−8	−18	−9	−25	−2	26	−17	−17	−15

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.342 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, 419, 838]: [0, 1, 36, 107] (certified at ell = 2147482943)
T = [(3, 1), (5, 1)]; h of degree 34 = 1 x 34 (phi(ord eps) x dim S_k^new); 4 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(838, 2)[2]   # 838.2.a.c

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

cargo run --release -p sagebrush-web --example atlas -- 838:2 1000