Atlas › Modular forms › Weight 2 › Level 654 › 654.2.a › 654.2.a.f

Newform orbit 654.2.a.f

Trace form

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

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

Coefficient field

The coefficients $a_n$ generate a number field of degree 5. It is generated by the eigenvalue $\alpha$ of $T = T_{5} + 2T_{7} + 3T_{11} + 4T_{13} + 5T_{17} + 6T_{19} + 7T_{23} + 8T_{29}$ , whose minimal polynomial is

$x^{5} - 18x^{4} - 1901x^{3} + 59137x^{2} - 578467x + 1839856$

Atkin–Lehner signs

$p$	$w_p$
2	$+1$
3	$+1$
109	$-1$

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
$\operatorname{tr} a_p$	−5	−5	−2	3	−1	5	−7	4	−8	8	13	13	17	8	−6	2	2	27	1	20	22	−8	−1	−3	8

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.463 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, 3, 6, 109, 218, 327, 654]: [0, 1, 1, 3, 9, 29, 38, 114] (certified at ell = 2147482801)
T = [(5, 1), (7, 2), (11, 3), (13, 4), (17, 5), (19, 6), (23, 7), (29, 8)]; h of degree 17 = 1 x 17 (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(654, 2)[5]   # 654.2.a.f

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

cargo run --release -p sagebrush-web --example atlas -- 654:2 1000