Atlas › Modular forms › Weight 4 › Level 213 › 213.4.a › 213.4.a.a

Newform orbit 213.4.a.a

$q$ -expansion

$q + 5q^{2} - 3q^{3} + 17q^{4} + 13q^{5} - 15q^{6} - 7q^{7} + 45q^{8} + 9q^{9} + 65q^{10} + 51q^{11} - 51q^{12} - 50q^{13} - 35q^{14} - 39q^{15} + 89q^{16} + 18q^{17} + 45q^{18} - 27q^{19} + 221q^{20} + 21q^{21} + 255q^{22} + 174q^{23} - 135q^{24} + O(q^{25})$

Coefficient field

The coefficients $a_n$ generate $\mathbb{Q}$ . The eigenvalue of $T = T_{2} + T_{5}$ is a root of

$x - 18$

Atkin–Lehner signs

$p$	$w_p$
3	$+1$
71	$+1$

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
$\operatorname{tr} a_p$	5	−3	13	−7	51	−50	18	−27	174	17	−139	84	−135	−451	−264	346	381	−383	−772	−71	−607	−2	1426	−966	1090

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

Sato–Tate

The normalized $a_p / 2p^{3/2}$ for the primes $p < 1000$ not dividing 213, against the semicircle $\tfrac{2}{\pi}\sqrt{1 - x^2}$ :

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.141 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 engine's checks

dim M^+ at levels [1, 3, 71, 213]: [1, 2, 19, 74] (certified at ell = 2147483171)
T = [(2, 1), (5, 1)]; h of degree 36 = 1 x 36 (phi(ord eps) x dim S_k^new); 6 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(213, 4)[0]   # 213.4.a.a

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

cargo run --release -p sagebrush-web --example atlas -- 213:4 1000