Atlas › Modular forms › Weight 2 › Level 493 › 493.2.a › 493.2.a.d

Newform orbit 493.2.a.d

Trace form

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

$4q + 2q^{2} + 3q^{3} + 8q^{4} + 3q^{5} - 5q^{6} + q^{7} + 11q^{9} - 7q^{10} + 15q^{11} - 13q^{12} - 2q^{13} + 9q^{14} + 7q^{15} + 12q^{16} + 4q^{17} + 27q^{18} + 11q^{19} - 3q^{20} - 4q^{21} + q^{22} - 2q^{23} - 29q^{24} + O(q^{25})$

Coefficient field

The coefficients $a_n$ generate a number field of degree 4. It is generated by the eigenvalue $\alpha$ of $T = T_{2} + 3T_{3} + 5T_{5} + 7T_{7}$ , whose minimal polynomial is

$x^{4} - 33x^{3} + 313x^{2} - 963x + 746$

Atkin–Lehner signs

$p$	$w_p$
17	$-1$
29	$+1$

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
$\operatorname{tr} a_p$	2	3	3	1	15	−2	4	11	−2	−4	−15	5	3	24	−6	6	−40	−11	10	19	−5	11	34	16	−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 0.309 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, 17, 29, 493]: [0, 2, 3, 46] (certified at ell = 2147480161)
T = [(2, 1), (3, 3), (5, 5), (7, 7)]; h of degree 37 = 1 x 37 (phi(ord eps) x dim S_k^new); 8 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(493, 2)[3]   # 493.2.a.d

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

cargo run --release -p sagebrush-web --example atlas -- 493:2 1000