Atlas › Modular forms › Weight 2 › Level 886 › 886.2.a › 886.2.a.h

Newform orbit 886.2.a.h

Trace form

The 4 newforms in this orbit are conjugate over $\mathbb{Q}$ ; the sum of their $q$ -expansions is

$4q + 4q^{2} + 8q^{3} + 4q^{4} + 4q^{5} + 8q^{6} + 3q^{7} + 4q^{8} + 4q^{9} + 4q^{10} + 5q^{11} + 8q^{12} - 5q^{13} + 3q^{14} + 8q^{15} + 4q^{16} - 2q^{17} + 4q^{18} - 7q^{19} + 4q^{20} + 6q^{21} + 5q^{22} + 13q^{23} + 8q^{24} + O(q^{25})$

Coefficient field

The coefficients $a_n$ generate a number field of degree 4. It is generated by the eigenvalue $\alpha$ of $T = T_{3} + 3T_{5}$ , whose minimal polynomial is

$x^{4} - 20x^{3} + 33x^{2} + 805x - 2894$

Atkin–Lehner signs

$p$	$w_p$
2	$-1$
443	$+1$

For $p \parallel N$ every form in the orbit has $a_p = -p^{k/2-1} w_p$ . The Fricke sign is $w_N = -1$ , so the sign of the functional equation is $(-1)^{k/2} w_N = +1$ : each L-function in the orbit has even analytic rank.

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
$\operatorname{tr} a_p$	4	8	4	3	5	−5	−2	−7	13	−1	5	−11	−2	−7	−6	−8	−2	−15	−24	−10	10	−6	28	27	26

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.394 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, 443, 886]: [0, 1, 38, 113] (certified at ell = 2147481311)
T = [(3, 1), (5, 3)]; h of degree 36 = 1 x 36 (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(886, 2)[7]   # 886.2.a.h

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

cargo run --release -p sagebrush-web --example atlas -- 886:2 1000