Atlas › Modular forms › Weight 2 › Level 498 › 498.2.a › 498.2.a.d

Newform orbit 498.2.a.d

Trace form

The 2 newforms in this orbit are conjugate over $\mathbb{Q}$ ; the sum of their $q$ -expansions is

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

Coefficient field

The coefficients $a_n$ generate $\mathbb{Q}(\sqrt{5})$ . It is generated by the eigenvalue $\alpha$ of $T = T_{5} + 3T_{7} + 5T_{11} + 7T_{13} + 9T_{17}$ , whose minimal polynomial is

$x^{2} + 164x + 6644$

Atkin–Lehner signs

$p$	$w_p$
2	$-1$
3	$+1$
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 odd 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
$\operatorname{tr} a_p$	2	−2	−5	−3	−4	−7	−9	−3	−3	−8	5	8	−13	3	8	3	6	4	−3	18	−20	16	2	0	−16

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.385 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, 3, 6, 83, 166, 249, 498]: [0, 1, 1, 3, 8, 23, 30, 88] (certified at ell = 2147483323)
T = [(5, 1), (7, 3), (11, 5), (13, 7), (17, 9)]; h of degree 15 = 1 x 15 (phi(ord eps) x dim S_k^new); 4 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(498, 2)[3]   # 498.2.a.d

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

cargo run --release -p sagebrush-web --example atlas -- 498:2 1000