Atlas › Modular forms › Weight 2 › Level 219 › 219.2.a › 219.2.a.d

Newform orbit 219.2.a.d

Trace form

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

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

Coefficient field

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

$x^{4} - 28x^{3} + 252x^{2} - 698x - 191$

Atkin–Lehner signs

$p$	$w_p$
3	$+1$
73	$-1$

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
$\operatorname{tr} a_p$	1	−4	9	−4	2	6	9	1	4	10	−10	−11	4	−10	7	11	11	23	−23	22	4	−3	13	8	5

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.371 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, 73, 219]: [0, 1, 6, 26] (certified at ell = 2147482873)
T = [(2, 1), (5, 3)]; h of degree 13 = 1 x 13 (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(219, 2)[3]   # 219.2.a.d

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

cargo run --release -p sagebrush-web --example atlas -- 219:2 1000