Atlas › Modular forms › Weight 4 › Level 171 › 171.4.a › 171.4.a.h

Newform orbit 171.4.a.h

Trace form

The 4 newforms in this orbit are conjugate over $\mathbb{Q}$ ; the sum of their $q$ -expansions is

$4q - 3q^{2} + 25q^{4} + 6q^{5} + 38q^{7} + 3q^{8} + 68q^{13} - 6q^{14} + q^{16} - 30q^{17} + 76q^{19} + 402q^{20} - 402q^{22} + 246q^{23} + O(q^{25})$

Coefficient field

The coefficients $a_n$ generate a number field of degree 4. It is generated by the eigenvalue $\alpha$ of $T = T_{2} + T_{5}$ , whose minimal polynomial is

$x^{4} - 3x^{3} - 333x^{2} + 489x + 26886$

Atkin–Lehner signs

$p$	$w_p$
3	— ( $3^2 \mid 171$ )
19	$-1$

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
$\operatorname{tr} a_p$	−3	0	6	38	0	68	−30	76	246	−6	188	620	294	218	−672	−294	−588	−514	368	−516	−166	−616	1062	3162	−2188

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.13 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, 3, 9, 19, 57, 171]: [1, 2, 4, 6, 22, 62] (certified at ell = 2147483647)
T = [(2, 1), (5, 1)]; h of degree 22 = 1 x 22 (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(171, 4)[7]   # 171.4.a.h

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

cargo run --release -p sagebrush-web --example atlas -- 171:4 1000