Atlas › Modular forms › Weight 2 › Level 645 › 645.2.a › 645.2.a.i

Newform orbit 645.2.a.i

Trace form

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

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

Coefficient field

The coefficients $a_n$ generate a number field of degree 3. It is generated by the eigenvalue $\alpha$ of $T = T_{2} + 2T_{7} + 3T_{13} + 4T_{17} + 5T_{19} + 6T_{11} + 7T_{23} + 8T_{29}$ , whose minimal polynomial is

$x^{3} + 152x^{2} - 2882x - 612146$

Atkin–Lehner signs

$p$	$w_p$
3	$+1$
5	$-1$
43	$-1$

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
$\operatorname{tr} a_p$	0	−3	3	−8	−1	−3	−3	−6	−9	−2	−7	−6	3	3	−12	3	−12	6	−27	12	−28	−8	−33	6	−15

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.659 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, 5, 15, 43, 129, 215, 645]: [0, 1, 1, 4, 4, 16, 24, 92] (certified at ell = 2147483353)
T = [(2, 1), (7, 2), (13, 3), (17, 4), (19, 5), (11, 6), (23, 7), (29, 8)]; h of degree 27 = 1 x 27 (phi(ord eps) x dim S_k^new); 8 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(645, 2)[8]   # 645.2.a.i

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

cargo run --release -p sagebrush-web --example atlas -- 645:2 1000