Atlas › Modular forms › Weight 2 › Level 738 › 738.2.a › 738.2.a.c

Newform orbit 738.2.a.c

$q$ -expansion

$q - q^{2} + q^{4} + q^{5} - 4q^{7} - q^{8} - q^{10} + 4q^{11} - 5q^{13} + 4q^{14} + q^{16} + q^{17} - 3q^{19} + q^{20} - 4q^{22} - 8q^{23} + O(q^{25})$

Coefficient field

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

$x + 26$

Atkin–Lehner signs

$p$	$w_p$
2	$+1$
3	— ( $3^2 \mid 738$ )
41	$+1$

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

Elliptic curve

By modularity this newform is the one attached to the isogeny class 738.c (Cremona's 738a). Its optimal curve 738a1 is

$y^2 + xy = x^3 - x^2 + 66x + 116$

of rank 1 with torsion of order 1. Its $a_p$ , computed by Sagebrush's point-counting engine, equal the newform's for every prime $p < 1000$ .

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
$\operatorname{tr} a_p$	−1	0	1	−4	4	−5	1	−3	−8	0	7	−4	−1	−6	−8	14	−7	−8	−5	−7	1	−14	−15	13	12

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

Sato–Tate

The normalized $a_p / 2p^{1/2}$ for the primes $p < 1000$ not dividing 738, against the semicircle $\tfrac{2}{\pi}\sqrt{1 - x^2}$ :

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.623 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, 9, 18, 41, 82, 123, 246, 369, 738]: [0, 1, 1, 3, 2, 5, 4, 12, 16, 46, 44, 130] (certified at ell = 2147482921)
T = [(5, 1), (7, 3), (11, 5), (13, 7)]; h of degree 18 = 1 x 18 (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(738, 2)[2]   # 738.2.a.c

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

cargo run --release -p sagebrush-web --example atlas -- 738:2 1000