Atlas › Modular forms › Weight 2 › Level 860 › 860.2.a › 860.2.a.c

Newform orbit 860.2.a.c

Trace form

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

$4q - q^{3} - 4q^{5} - 7q^{7} + 5q^{9} - 5q^{13} + q^{15} + 5q^{17} - 2q^{19} - 8q^{21} - 19q^{23} + O(q^{25})$

Coefficient field

The coefficients $a_n$ generate a number field of degree 4. It is generated by the eigenvalue $\alpha$ of $T = T_{3} + T_{7}$ , whose minimal polynomial is

$x^{4} + 8x^{3} + 9x^{2} - 35x - 54$

Atkin–Lehner signs

$p$	$w_p$
2	— ( $2^2 \mid 860$ )
5	$+1$
43	$-1$

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

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	−4	−7	0	−5	5	−2	−19	−6	−16	−21	4	4	−8	−11	13	−6	−19	−6	1	−11	−5	32	21

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.277 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, 5, 10, 20, 43, 86, 172, 215, 430, 860]: [0, 1, 2, 1, 3, 6, 4, 13, 25, 24, 70, 138] (certified at ell = 2147483353)
T = [(3, 1), (7, 1)]; h of degree 14 = 1 x 14 (phi(ord eps) x dim S_k^new); 2 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(860, 2)[2]   # 860.2.a.c

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

cargo run --release -p sagebrush-web --example atlas -- 860:2 1000