Atlas › Modular forms › Weight 2 › Level 170 › 170.2.a › 170.2.a.f

Newform orbit 170.2.a.f

Trace form

The 2 newforms in this orbit are conjugate over $\mathbb{Q}$ ; the sum of their $q$ -expansions is

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

Coefficient field

The coefficients $a_n$ generate $\mathbb{Q}(\sqrt{17})$ . It is generated by the eigenvalue $\alpha$ of $T = T_{3} + 3T_{7} + 5T_{11} + 7T_{13} + 9T_{19}$ , whose minimal polynomial is

$x^{2} + 9x - 18$

Atkin–Lehner signs

$p$	$w_p$
2	$-1$
5	$-1$
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 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	−1	2	2	−8	5	2	−1	−2	1	−9	−6	−8	6	9	3	−13	19	−10	−21	7	0	4	−7	9

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.219 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, 2, 5, 10, 17, 34, 85, 170]: [0, 1, 1, 3, 2, 6, 10, 30] (certified at ell = 2147483489)
T = [(3, 1), (7, 3), (11, 5), (13, 7), (19, 9)]; h of degree 7 = 1 x 7 (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(170, 2)[5]   # 170.2.a.f

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

cargo run --release -p sagebrush-web --example atlas -- 170:2 1000