# Properties

 Label 666.2.a.i Level $666$ Weight $2$ Character orbit 666.a Self dual yes Analytic conductor $5.318$ Analytic rank $0$ Dimension $2$ CM no Inner twists $1$

# Related objects

Show commands: Magma / PariGP / SageMath

## Newspace parameters

comment: Compute space of new eigenforms

[N,k,chi] = [666,2,Mod(1,666)]

mf = mfinit([N,k,chi],0)

lf = mfeigenbasis(mf)

from sage.modular.dirichlet import DirichletCharacter

H = DirichletGroup(666, base_ring=CyclotomicField(2))

chi = DirichletCharacter(H, H._module([0, 0]))

N = Newforms(chi, 2, names="a")

//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code

chi := DirichletCharacter("666.1");

S:= CuspForms(chi, 2);

N := Newforms(S);

 Level: $$N$$ $$=$$ $$666 = 2 \cdot 3^{2} \cdot 37$$ Weight: $$k$$ $$=$$ $$2$$ Character orbit: $$[\chi]$$ $$=$$ 666.a (trivial)

## Newform invariants

comment: select newform

sage: f = N[0] # Warning: the index may be different

gp: f = lf[1] \\ Warning: the index may be different

 Self dual: yes Analytic conductor: $$5.31803677462$$ Analytic rank: $$0$$ Dimension: $$2$$ Coefficient field: $$\Q(\sqrt{5})$$ comment: defining polynomial  gp: f.mod \\ as an extension of the character field Defining polynomial: $$x^{2} - x - 1$$ x^2 - x - 1 Coefficient ring: $$\Z[a_1, \ldots, a_{7}]$$ Coefficient ring index: $$1$$ Twist minimal: no (minimal twist has level 74) Fricke sign: $$-1$$ Sato-Tate group: $\mathrm{SU}(2)$

## $q$-expansion

comment: q-expansion

sage: f.q_expansion() # note that sage often uses an isomorphic number field

gp: mfcoefs(f, 20)

Coefficients of the $$q$$-expansion are expressed in terms of $$\beta = \frac{1}{2}(1 + \sqrt{5})$$. We also show the integral $$q$$-expansion of the trace form.

 $$f(q)$$ $$=$$ $$q - q^{2} + q^{4} + ( - 3 \beta + 1) q^{5} - 2 \beta q^{7} - q^{8} +O(q^{10})$$ q - q^2 + q^4 + (-3*b + 1) * q^5 - 2*b * q^7 - q^8 $$q - q^{2} + q^{4} + ( - 3 \beta + 1) q^{5} - 2 \beta q^{7} - q^{8} + (3 \beta - 1) q^{10} + ( - \beta + 3) q^{11} + ( - 3 \beta + 2) q^{13} + 2 \beta q^{14} + q^{16} + (4 \beta - 2) q^{17} + (4 \beta - 2) q^{19} + ( - 3 \beta + 1) q^{20} + (\beta - 3) q^{22} + ( - 3 \beta + 2) q^{23} + (3 \beta + 5) q^{25} + (3 \beta - 2) q^{26} - 2 \beta q^{28} + (7 \beta - 2) q^{29} + ( - \beta + 9) q^{31} - q^{32} + ( - 4 \beta + 2) q^{34} + (4 \beta + 6) q^{35} - q^{37} + ( - 4 \beta + 2) q^{38} + (3 \beta - 1) q^{40} + ( - \beta - 8) q^{41} + ( - 2 \beta - 2) q^{43} + ( - \beta + 3) q^{44} + (3 \beta - 2) q^{46} + (2 \beta - 2) q^{47} + (4 \beta - 3) q^{49} + ( - 3 \beta - 5) q^{50} + ( - 3 \beta + 2) q^{52} + ( - 4 \beta + 6) q^{53} + ( - 7 \beta + 6) q^{55} + 2 \beta q^{56} + ( - 7 \beta + 2) q^{58} + ( - 2 \beta + 8) q^{59} + (\beta + 9) q^{61} + (\beta - 9) q^{62} + q^{64} + 11 q^{65} + (5 \beta - 7) q^{67} + (4 \beta - 2) q^{68} + ( - 4 \beta - 6) q^{70} + ( - 8 \beta + 10) q^{71} + (5 \beta - 1) q^{73} + q^{74} + (4 \beta - 2) q^{76} + ( - 4 \beta + 2) q^{77} + ( - 9 \beta + 6) q^{79} + ( - 3 \beta + 1) q^{80} + (\beta + 8) q^{82} + (4 \beta + 8) q^{83} + ( - 2 \beta - 14) q^{85} + (2 \beta + 2) q^{86} + (\beta - 3) q^{88} + ( - 4 \beta + 8) q^{89} + (2 \beta + 6) q^{91} + ( - 3 \beta + 2) q^{92} + ( - 2 \beta + 2) q^{94} + ( - 2 \beta - 14) q^{95} + ( - 4 \beta + 6) q^{97} + ( - 4 \beta + 3) q^{98} +O(q^{100})$$ q - q^2 + q^4 + (-3*b + 1) * q^5 - 2*b * q^7 - q^8 + (3*b - 1) * q^10 + (-b + 3) * q^11 + (-3*b + 2) * q^13 + 2*b * q^14 + q^16 + (4*b - 2) * q^17 + (4*b - 2) * q^19 + (-3*b + 1) * q^20 + (b - 3) * q^22 + (-3*b + 2) * q^23 + (3*b + 5) * q^25 + (3*b - 2) * q^26 - 2*b * q^28 + (7*b - 2) * q^29 + (-b + 9) * q^31 - q^32 + (-4*b + 2) * q^34 + (4*b + 6) * q^35 - q^37 + (-4*b + 2) * q^38 + (3*b - 1) * q^40 + (-b - 8) * q^41 + (-2*b - 2) * q^43 + (-b + 3) * q^44 + (3*b - 2) * q^46 + (2*b - 2) * q^47 + (4*b - 3) * q^49 + (-3*b - 5) * q^50 + (-3*b + 2) * q^52 + (-4*b + 6) * q^53 + (-7*b + 6) * q^55 + 2*b * q^56 + (-7*b + 2) * q^58 + (-2*b + 8) * q^59 + (b + 9) * q^61 + (b - 9) * q^62 + q^64 + 11 * q^65 + (5*b - 7) * q^67 + (4*b - 2) * q^68 + (-4*b - 6) * q^70 + (-8*b + 10) * q^71 + (5*b - 1) * q^73 + q^74 + (4*b - 2) * q^76 + (-4*b + 2) * q^77 + (-9*b + 6) * q^79 + (-3*b + 1) * q^80 + (b + 8) * q^82 + (4*b + 8) * q^83 + (-2*b - 14) * q^85 + (2*b + 2) * q^86 + (b - 3) * q^88 + (-4*b + 8) * q^89 + (2*b + 6) * q^91 + (-3*b + 2) * q^92 + (-2*b + 2) * q^94 + (-2*b - 14) * q^95 + (-4*b + 6) * q^97 + (-4*b + 3) * q^98 $$\operatorname{Tr}(f)(q)$$ $$=$$ $$2 q - 2 q^{2} + 2 q^{4} - q^{5} - 2 q^{7} - 2 q^{8}+O(q^{10})$$ 2 * q - 2 * q^2 + 2 * q^4 - q^5 - 2 * q^7 - 2 * q^8 $$2 q - 2 q^{2} + 2 q^{4} - q^{5} - 2 q^{7} - 2 q^{8} + q^{10} + 5 q^{11} + q^{13} + 2 q^{14} + 2 q^{16} - q^{20} - 5 q^{22} + q^{23} + 13 q^{25} - q^{26} - 2 q^{28} + 3 q^{29} + 17 q^{31} - 2 q^{32} + 16 q^{35} - 2 q^{37} + q^{40} - 17 q^{41} - 6 q^{43} + 5 q^{44} - q^{46} - 2 q^{47} - 2 q^{49} - 13 q^{50} + q^{52} + 8 q^{53} + 5 q^{55} + 2 q^{56} - 3 q^{58} + 14 q^{59} + 19 q^{61} - 17 q^{62} + 2 q^{64} + 22 q^{65} - 9 q^{67} - 16 q^{70} + 12 q^{71} + 3 q^{73} + 2 q^{74} + 3 q^{79} - q^{80} + 17 q^{82} + 20 q^{83} - 30 q^{85} + 6 q^{86} - 5 q^{88} + 12 q^{89} + 14 q^{91} + q^{92} + 2 q^{94} - 30 q^{95} + 8 q^{97} + 2 q^{98}+O(q^{100})$$ 2 * q - 2 * q^2 + 2 * q^4 - q^5 - 2 * q^7 - 2 * q^8 + q^10 + 5 * q^11 + q^13 + 2 * q^14 + 2 * q^16 - q^20 - 5 * q^22 + q^23 + 13 * q^25 - q^26 - 2 * q^28 + 3 * q^29 + 17 * q^31 - 2 * q^32 + 16 * q^35 - 2 * q^37 + q^40 - 17 * q^41 - 6 * q^43 + 5 * q^44 - q^46 - 2 * q^47 - 2 * q^49 - 13 * q^50 + q^52 + 8 * q^53 + 5 * q^55 + 2 * q^56 - 3 * q^58 + 14 * q^59 + 19 * q^61 - 17 * q^62 + 2 * q^64 + 22 * q^65 - 9 * q^67 - 16 * q^70 + 12 * q^71 + 3 * q^73 + 2 * q^74 + 3 * q^79 - q^80 + 17 * q^82 + 20 * q^83 - 30 * q^85 + 6 * q^86 - 5 * q^88 + 12 * q^89 + 14 * q^91 + q^92 + 2 * q^94 - 30 * q^95 + 8 * q^97 + 2 * q^98

## Embeddings

For each embedding $$\iota_m$$ of the coefficient field, the values $$\iota_m(a_n)$$ are shown below.

For more information on an embedded modular form you can click on its label.

comment: embeddings in the coefficient field

gp: mfembed(f)

Label   $$\iota_m(\nu)$$ $$a_{2}$$ $$a_{3}$$ $$a_{4}$$ $$a_{5}$$ $$a_{6}$$ $$a_{7}$$ $$a_{8}$$ $$a_{9}$$ $$a_{10}$$
1.1
 1.61803 −0.618034
−1.00000 0 1.00000 −3.85410 0 −3.23607 −1.00000 0 3.85410
1.2 −1.00000 0 1.00000 2.85410 0 1.23607 −1.00000 0 −2.85410
 $$n$$: e.g. 2-40 or 990-1000 Significant digits: Format: Complex embeddings Normalized embeddings Satake parameters Satake angles

## Atkin-Lehner signs

$$p$$ Sign
$$2$$ $$+1$$
$$3$$ $$-1$$
$$37$$ $$+1$$

## Inner twists

This newform does not admit any (nontrivial) inner twists.

## Twists

By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 666.2.a.i 2
3.b odd 2 1 74.2.a.b 2
4.b odd 2 1 5328.2.a.bc 2
12.b even 2 1 592.2.a.g 2
15.d odd 2 1 1850.2.a.t 2
15.e even 4 2 1850.2.b.j 4
21.c even 2 1 3626.2.a.s 2
24.f even 2 1 2368.2.a.u 2
24.h odd 2 1 2368.2.a.y 2
33.d even 2 1 8954.2.a.j 2
111.d odd 2 1 2738.2.a.g 2

By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
74.2.a.b 2 3.b odd 2 1
592.2.a.g 2 12.b even 2 1
666.2.a.i 2 1.a even 1 1 trivial
1850.2.a.t 2 15.d odd 2 1
1850.2.b.j 4 15.e even 4 2
2368.2.a.u 2 24.f even 2 1
2368.2.a.y 2 24.h odd 2 1
2738.2.a.g 2 111.d odd 2 1
3626.2.a.s 2 21.c even 2 1
5328.2.a.bc 2 4.b odd 2 1
8954.2.a.j 2 33.d even 2 1

## Hecke kernels

This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on $$S_{2}^{\mathrm{new}}(\Gamma_0(666))$$:

 $$T_{5}^{2} + T_{5} - 11$$ T5^2 + T5 - 11 $$T_{7}^{2} + 2T_{7} - 4$$ T7^2 + 2*T7 - 4

## Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ $$(T + 1)^{2}$$
$3$ $$T^{2}$$
$5$ $$T^{2} + T - 11$$
$7$ $$T^{2} + 2T - 4$$
$11$ $$T^{2} - 5T + 5$$
$13$ $$T^{2} - T - 11$$
$17$ $$T^{2} - 20$$
$19$ $$T^{2} - 20$$
$23$ $$T^{2} - T - 11$$
$29$ $$T^{2} - 3T - 59$$
$31$ $$T^{2} - 17T + 71$$
$37$ $$(T + 1)^{2}$$
$41$ $$T^{2} + 17T + 71$$
$43$ $$T^{2} + 6T + 4$$
$47$ $$T^{2} + 2T - 4$$
$53$ $$T^{2} - 8T - 4$$
$59$ $$T^{2} - 14T + 44$$
$61$ $$T^{2} - 19T + 89$$
$67$ $$T^{2} + 9T - 11$$
$71$ $$T^{2} - 12T - 44$$
$73$ $$T^{2} - 3T - 29$$
$79$ $$T^{2} - 3T - 99$$
$83$ $$T^{2} - 20T + 80$$
$89$ $$T^{2} - 12T + 16$$
$97$ $$T^{2} - 8T - 4$$