Atlas › Modular forms › Weight 2 › Level 874 › 874.2.a › 874.2.a.m

Newform orbit 874.2.a.m

Trace form

The 7 newforms in this orbit are conjugate over $\mathbb{Q}$ ; the sum of their $q$ -expansions is

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

Coefficient field

The coefficients $a_n$ generate a number field of degree 7. It is generated by the eigenvalue $\alpha$ of $T = T_{3} + 3T_{5}$ , whose minimal polynomial is

$x^{7} - 22x^{6} - 27x^{5} + 3406x^{4} - 20925x^{3} + 3812x^{2} + 143434x - 186692$

Atkin–Lehner signs

$p$	$w_p$
2	$-1$
19	$+1$
23	$+1$

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
$\operatorname{tr} a_p$	7	1	7	0	7	7	−2	−7	−7	15	4	13	12	−25	16	7	−29	0	−41	10	2	4	−21	−4	−11

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.323 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, 19, 23, 38, 46, 437, 874]: [0, 1, 2, 3, 7, 8, 42, 124] (certified at ell = 2147483647)
T = [(3, 1), (5, 3)]; h of degree 33 = 1 x 33 (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(874, 2)[12]   # 874.2.a.m

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

cargo run --release -p sagebrush-web --example atlas -- 874:2 1000