Atlas › Modular forms › Weight 2 › Level 267 › 267.2.a › 267.2.a.c

Newform orbit 267.2.a.c

Trace form

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

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

Coefficient field

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

$x^{3} + 11x^{2} + 38x + 41$

Atkin–Lehner signs

$p$	$w_p$
3	$-1$
89	$-1$

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
$\operatorname{tr} a_p$	−4	3	−7	−4	−8	−11	−4	0	−7	−6	−3	−11	5	7	−10	−5	0	−2	−5	−11	−2	15	14	3	−20

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.271 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, 3, 89, 267]: [0, 1, 8, 32] (certified at ell = 2147482921)
T = [(2, 1), (5, 1)]; h of degree 15 = 1 x 15 (phi(ord eps) x dim S_k^new); 2 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(267, 2)[2]   # 267.2.a.c

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

cargo run --release -p sagebrush-web --example atlas -- 267:2 1000