Atlas › Modular forms › Weight 4 › Level 160 › 160.4.a › 160.4.a.c

Newform orbit 160.4.a.c

Trace form

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

$2q - 8q^{3} + 10q^{5} - 8q^{7} + 26q^{9} - 64q^{11} + 12q^{13} - 40q^{15} + 4q^{17} - 208q^{19} - 208q^{21} - 120q^{23} + O(q^{25})$

Coefficient field

The coefficients $a_n$ generate $\mathbb{Q}(\sqrt{6})$ . It is generated by the eigenvalue $\alpha$ of $T = T_{3} + T_{7}$ , whose minimal polynomial is

$x^{2} + 16x - 320$

Atkin–Lehner signs

$p$	$w_p$
2	— ( $2^2 \mid 160$ )
5	$-1$

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
$\operatorname{tr} a_p$	0	−8	10	−8	−64	12	4	−208	−120	−292	−176	−356	100	376	280	316	−720	−1268	744	48	−940	−32	1592	−780	1220

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.143 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, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160]: [1, 2, 3, 3, 5, 7, 8, 12, 14, 22, 40, 76] (certified at ell = 2147483497)
T = [(3, 1), (7, 1)]; h of degree 12 = 1 x 12 (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(160, 4)[2]   # 160.4.a.c

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

cargo run --release -p sagebrush-web --example atlas -- 160:4 1000