Atlas › Modular forms › Weight 2 › Level 474 › 474.2.a › 474.2.a.d

Newform orbit 474.2.a.d

Trace form

The 2 newforms in this orbit are conjugate over $\mathbb{Q}$ ; the sum of their $q$ -expansions is

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

Coefficient field

The coefficients $a_n$ generate $\mathbb{Q}(\sqrt{5})$ . It is generated by the eigenvalue $\alpha$ of $T = T_{5} + 3T_{7}$ , whose minimal polynomial is

$x^{2} - 125$

Atkin–Lehner signs

$p$	$w_p$
2	$+1$
3	$-1$
79	$+1$

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
$\operatorname{tr} a_p$	−2	2	3	−1	8	−4	7	3	−3	8	−4	−15	9	4	14	−16	7	−5	7	8	3	−2	2	−20	−23

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.227 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, 79, 158, 237, 474]: [0, 1, 1, 3, 7, 22, 28, 84] (certified at ell = 2147483053)
T = [(5, 1), (7, 3)]; h of degree 13 = 1 x 13 (phi(ord eps) x dim S_k^new); 2 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(474, 2)[3]   # 474.2.a.d

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

cargo run --release -p sagebrush-web --example atlas -- 474:2 1000