Defining parameters
Level: | \( N \) | \(=\) | \( 21 = 3 \cdot 7 \) |
Weight: | \( k \) | \(=\) | \( 16 \) |
Character orbit: | \([\chi]\) | \(=\) | 21.c (of order \(2\) and degree \(1\)) |
Character conductor: | \(\operatorname{cond}(\chi)\) | \(=\) | \( 21 \) |
Character field: | \(\Q\) | ||
Newform subspaces: | \( 2 \) | ||
Sturm bound: | \(42\) | ||
Trace bound: | \(1\) | ||
Distinguishing \(T_p\): | \(2\) |
Dimensions
The following table gives the dimensions of various subspaces of \(M_{16}(21, [\chi])\).
Total | New | Old | |
---|---|---|---|
Modular forms | 42 | 42 | 0 |
Cusp forms | 38 | 38 | 0 |
Eisenstein series | 4 | 4 | 0 |
Trace form
Decomposition of \(S_{16}^{\mathrm{new}}(21, [\chi])\) into newform subspaces
Label | Dim | $A$ | Field | CM | Traces | $q$-expansion | |||
---|---|---|---|---|---|---|---|---|---|
$a_{2}$ | $a_{3}$ | $a_{5}$ | $a_{7}$ | ||||||
21.16.c.a | $2$ | $29.966$ | \(\Q(\sqrt{-3}) \) | \(\Q(\sqrt{-3}) \) | \(0\) | \(0\) | \(0\) | \(-1244900\) | \(q-3^{5}\zeta_{6}q^{3}+2^{15}q^{4}+(-622450+\cdots)q^{7}+\cdots\) |
21.16.c.b | $36$ | $29.966$ | None | \(0\) | \(0\) | \(0\) | \(2295860\) |