Atlas › Modular forms › Weight 4 › Level 198 › 198.4.a › 198.4.a.i

Newform orbit 198.4.a.i

Trace form

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

$2q - 4q^{2} + 8q^{4} + 8q^{5} + 36q^{7} - 16q^{8} - 16q^{10} - 22q^{11} + 60q^{13} - 72q^{14} + 32q^{16} - 92q^{17} + 44q^{19} + 32q^{20} + 44q^{22} - 24q^{23} + O(q^{25})$

Coefficient field

The coefficients $a_n$ generate $\mathbb{Q}(\sqrt{70})$ . It is generated by the eigenvalue $\alpha$ of $T = T_{5} + 3T_{7} + 5T_{13} + 7T_{17}$ , whose minimal polynomial is

$x^{2} + 228x - 88084$

Atkin–Lehner signs

$p$	$w_p$
2	$+1$
3	— ( $3^2 \mid 198$ )
11	$+1$

For $p \parallel N$ every form in the orbit has $a_p = -p^{k/2-1} w_p$ .

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	0	8	36	−22	60	−92	44	−24	100	264	36	188	−12	448	688	24	84	−352	−304	−1156	−1932	−968	1312	84

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.288 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 engine's checks

dim M^+ at levels [1, 2, 3, 6, 9, 11, 18, 22, 33, 66, 99, 198]: [1, 2, 2, 5, 4, 4, 11, 11, 14, 40, 38, 112] (certified at ell = 2147482951)
T = [(5, 1), (7, 3), (13, 5), (17, 7)]; h of degree 13 = 1 x 13 (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(198, 4)[8]   # 198.4.a.i

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

cargo run --release -p sagebrush-web --example atlas -- 198:4 1000