Atlas › Modular forms › Weight 4 › Level 238 › 238.4.a › 238.4.a.c

Newform orbit 238.4.a.c

Trace form

The 3 newforms in this orbit are conjugate over $\mathbb{Q}$ ; the sum of their $q$ -expansions is

$3q - 6q^{2} - 5q^{3} + 12q^{4} - 21q^{5} + 10q^{6} + 21q^{7} - 24q^{8} + 38q^{9} + 42q^{10} - 18q^{11} - 20q^{12} + 14q^{13} - 42q^{14} + 56q^{15} + 48q^{16} - 51q^{17} - 76q^{18} + 128q^{19} - 84q^{20} - 35q^{21} + 36q^{22} - 210q^{23} + 40q^{24} + O(q^{25})$

Coefficient field

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

$x^{3} + 68x^{2} + 469x - 22062$

Atkin–Lehner signs

$p$	$w_p$
2	$+1$
7	$-1$
17	$+1$

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
$\operatorname{tr} a_p$	−6	−5	−21	21	−18	14	−51	128	−210	−72	−201	136	−809	−269	−298	−833	−1324	−297	755	−320	−1379	2246	822	−564	2669

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.187 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, 7, 14, 17, 34, 119, 238]: [1, 2, 3, 8, 6, 16, 38, 112] (certified at ell = 2147483137)
T = [(3, 1), (5, 3)]; h of degree 24 = 1 x 24 (phi(ord eps) x dim S_k^new); 5 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(238, 4)[2]   # 238.4.a.c

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

cargo run --release -p sagebrush-web --example atlas -- 238:4 1000