Atlas › Modular forms › Weight 4 › Level 240 › 240.4.a › 240.4.a.b

Newform orbit 240.4.a.b

$q$ -expansion

$q - 3q^{3} - 5q^{5} + 4q^{7} + 9q^{9} + 48q^{11} + 2q^{13} + 15q^{15} - 114q^{17} - 140q^{19} - 12q^{21} - 72q^{23} + O(q^{25})$

Coefficient field

The coefficients $a_n$ generate $\mathbb{Q}$ . The eigenvalue of $T = T_{7} + 3T_{11} + 5T_{13} + 7T_{17} + 9T_{19} + 11T_{23}$ is a root of

$x + 2692$

Atkin–Lehner signs

$p$	$w_p$
2	— ( $2^2 \mid 240$ )
3	$+1$
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	−3	−5	4	48	2	−114	−140	−72	210	−272	−334	−198	268	−216	−78	−240	302	−596	768	−478	640	348	210	−1534

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

Sato–Tate

The normalized $a_p / 2p^{3/2}$ for the primes $p < 1000$ not dividing 240, against the semicircle $\tfrac{2}{\pi}\sqrt{1 - x^2}$ :

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.67 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, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 48, 60, 80, 120, 240]: [1, 2, 2, 3, 3, 5, 5, 7, 9, 8, 8, 12, 16, 22, 22, 28, 42, 40, 80, 152] (certified at ell = 2147483629)
T = [(7, 1), (11, 3), (13, 5), (17, 7), (19, 9), (23, 11)]; h of degree 12 = 1 x 12 (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(240, 4)[1]   # 240.4.a.b

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

cargo run --release -p sagebrush-web --example atlas -- 240:4 1000