Atlas › Modular forms › Weight 2 › Level 83 › 83.2.a › 83.2.a.b

Newform orbit 83.2.a.b

Trace form

The 6 newforms in this orbit are conjugate over $\mathbb{Q}$ ; the sum of their $q$ -expansions is

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

Coefficient field

The coefficients $a_n$ generate a number field of degree 6. It is generated by the eigenvalue $\alpha$ of $T = T_{2} + T_{3}$ , whose minimal polynomial is

$x^{6} - 2x^{5} - 11x^{4} + 33x^{3} - 20x^{2} - 4x + 2$

Atkin–Lehner signs

$p$	$w_p$
83	$-1$

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
$\operatorname{tr} a_p$	1	1	2	3	−3	14	−5	−4	−5	−1	3	39	−1	−8	−12	14	−17	−5	16	−26	−6	−12	6	−22	6

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.156 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, 83]: [0, 8] (certified at ell = 2147483323)
T = [(2, 1), (3, 1)]; h of degree 7 = 1 x 7 (phi(ord eps) x dim S_k^new); 1 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(83, 2)[1]   # 83.2.a.b

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

cargo run --release -p sagebrush-web --example atlas -- 83:2 1000