Atlas › Modular forms › Weight 4 › Level 78 › 78.4.a › 78.4.a.f

Newform orbit 78.4.a.f

$q$ -expansion

$q + 2q^{2} + 3q^{3} + 4q^{4} + 4q^{5} + 6q^{6} + 4q^{7} + 8q^{8} + 9q^{9} + 8q^{10} + 2q^{11} + 12q^{12} - 13q^{13} + 8q^{14} + 12q^{15} + 16q^{16} - 6q^{17} + 18q^{18} - 36q^{19} + 16q^{20} + 12q^{21} + 4q^{22} - 20q^{23} + 24q^{24} + O(q^{25})$

Coefficient field

The coefficients $a_n$ generate $\mathbb{Q}$ . The eigenvalue of $T = T_{5} + 3T_{7} + 5T_{11} + 7T_{17}$ is a root of

$x + 16$

Atkin–Lehner signs

$p$	$w_p$
2	$-1$
3	$-1$
13	$+1$

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	4	4	2	−13	−6	−36	−20	−14	−152	−258	84	−188	254	366	550	−14	448	926	254	1328	186	−336	614

$\operatorname{tr} a_n$ 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 78, against the semicircle $\tfrac{2}{\pi}\sqrt{1 - x^2}$ :

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.133 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, 2, 3, 6, 13, 26, 39, 78]: [1, 2, 2, 5, 5, 13, 16, 46] (certified at ell = 2147483629)
T = [(5, 1), (7, 3), (11, 5), (17, 7)]; h of degree 6 = 1 x 6 (phi(ord eps) x dim S_k^new); 3 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(78, 4)[5]   # 78.4.a.f

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

cargo run --release -p sagebrush-web --example atlas -- 78:4 1000