Atlas › Modular forms › Weight 2 › Level 347 › 347.2.a › 347.2.a.c

Newform orbit 347.2.a.c

Trace form

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

$7q - 2q^{2} - 7q^{3} + 4q^{4} - 8q^{5} - 3q^{6} - 5q^{7} + 3q^{8} + 10q^{9} - 6q^{10} + 2q^{11} - 19q^{12} - 22q^{13} - q^{14} + 6q^{15} + 2q^{16} - 9q^{17} - 11q^{19} - 9q^{20} - 4q^{21} - 27q^{22} + 2q^{23} + O(q^{25})$

Coefficient field

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

$x^{7} + 9x^{6} + 19x^{5} - 13x^{4} - 35x^{3} + 8x^{2} + 11x - 1$

Atkin–Lehner signs

$p$	$w_p$
347	$+1$

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
$\operatorname{tr} a_p$	−2	−7	−8	−5	2	−22	−9	−11	2	3	−11	−40	−8	17	32	2	−20	−21	11	3	−31	−21	12	23	−72

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.26 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, 347]: [0, 30] (certified at ell = 2147481179)
T = [(2, 1), (3, 1)]; h of degree 29 = 1 x 29 (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(347, 2)[2]   # 347.2.a.c

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

cargo run --release -p sagebrush-web --example atlas -- 347:2 1000