Atlas › Modular forms › Weight 2 › Level 725 › 725.2.a › 725.2.a.a

Newform orbit 725.2.a.a

$q$ -expansion

$q + q^{2} - q^{4} + 2q^{7} - 3q^{8} - 3q^{9} - 6q^{11} - 2q^{13} + 2q^{14} - q^{16} + 2q^{17} - 3q^{18} - 2q^{19} - 6q^{22} - 2q^{23} + O(q^{25})$

Coefficient field

The coefficients $a_n$ generate $\mathbb{Q}$ . The eigenvalue of $T = T_{2} + 3T_{3}$ is a root of

$x - 1$

Atkin–Lehner signs

$p$	$w_p$
5	— ( $5^2 \mid 725$ )
29	$+1$

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 725.a (Cremona's 725a). Its optimal curve 725a1 is

$y^2 + xy = x^3 - x^2 - 67x + 216$

of rank 1 with torsion of order 2. 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	0	2	−6	−2	2	−2	−2	−1	2	−10	2	−8	12	6	−8	−6	−2	−12	6	−10	14	18	−2

$\operatorname{tr} a_n$ 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 725, against the semicircle $\tfrac{2}{\pi}\sqrt{1 - x^2}$ :

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.248 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, 5, 25, 29, 145, 725]: [0, 1, 3, 3, 16, 76] (certified at ell = 2147482681)
T = [(2, 1), (3, 3)]; h of degree 45 = 1 x 45 (phi(ord eps) x dim S_k^new); 6 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(725, 2)[0]   # 725.2.a.a

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

cargo run --release -p sagebrush-web --example atlas -- 725:2 1000