# Properties

 Base field $$\Q(\sqrt{2})$$ Weight [2, 2] Level norm 256 Level $[256, 16, 16]$ Label 2.2.8.1-256.1-d Dimension 1 CM no Base change yes

# Related objects

## Base field $$\Q(\sqrt{2})$$

Generator $$w$$, with minimal polynomial $$x^{2} - 2$$; narrow class number $$1$$ and class number $$1$$.

## Form

 Weight [2, 2] Level $[256, 16, 16]$ Label 2.2.8.1-256.1-d Dimension 1 Is CM no Is base change yes Parent newspace dimension 4

## Hecke eigenvalues ($q$-expansion)

The Hecke eigenvalue field is $\Q$.
Norm Prime Eigenvalue
2 $[2, 2, -w]$ $\phantom{-}0$
7 $[7, 7, -2w + 1]$ $-4$
7 $[7, 7, -2w - 1]$ $-4$
9 $[9, 3, 3]$ $-2$
17 $[17, 17, 3w + 1]$ $-2$
17 $[17, 17, 3w - 1]$ $-2$
23 $[23, 23, w + 5]$ $\phantom{-}4$
23 $[23, 23, -w + 5]$ $\phantom{-}4$
25 $[25, 5, 5]$ $-6$
31 $[31, 31, 4w + 1]$ $\phantom{-}0$
31 $[31, 31, -4w + 1]$ $\phantom{-}0$
41 $[41, 41, 2w - 7]$ $-6$
41 $[41, 41, -2w - 7]$ $-6$
47 $[47, 47, -w - 7]$ $-8$
47 $[47, 47, w - 7]$ $-8$
71 $[71, 71, -6w - 1]$ $\phantom{-}12$
71 $[71, 71, 6w - 1]$ $\phantom{-}12$
73 $[73, 73, -7w - 5]$ $\phantom{-}14$
73 $[73, 73, 7w - 5]$ $\phantom{-}14$
79 $[79, 79, -w - 9]$ $-8$
 Display number of eigenvalues

## Atkin-Lehner eigenvalues

Norm Prime Eigenvalue
2 $[2, 2, -w]$ $-1$