Atlas › Modular forms › Weight 2 › Level 892 › 892.2.a › 892.2.a.a

Newform orbit 892.2.a.a

$q$ -expansion

$q - q^{3} + 2q^{5} - 2q^{7} - 2q^{9} - 3q^{11} + 6q^{13} - 2q^{15} - 7q^{17} + 2q^{21} - 9q^{23} + O(q^{25})$

Coefficient field

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

$x - 5$

Atkin–Lehner signs

$p$	$w_p$
2	— ( $2^2 \mid 892$ )
223	$-1$

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 892.a (Cremona's 892c). Its optimal curve 892c1 is

$y^2 = x^3 - x^2 - 12x - 8$

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
$\operatorname{tr} a_p$	0	−1	2	−2	−3	6	−7	0	−9	7	−4	−1	−9	0	4	1	−9	6	−11	0	−5	4	−12	−9	−18

$\operatorname{tr} a_n$ 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 892, against the semicircle $\tfrac{2}{\pi}\sqrt{1 - x^2}$ :

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.264 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, 4, 223, 446, 892]: [0, 1, 2, 19, 58, 115] (certified at ell = 2147482591)
T = [(3, 1), (5, 3)]; h of degree 18 = 1 x 18 (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(892, 2)[0]   # 892.2.a.a

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

cargo run --release -p sagebrush-web --example atlas -- 892:2 1000