A257090 a(n) = log_2 (A256691(n)).

0, 2, 2, 5, 2, 4, 2, 7, 5, 4, 2, 7, 2, 4, 4, 11, 2, 7, 2, 7, 4, 4, 2, 9, 5, 4, 7, 7, 2, 6, 2, 13, 4, 4, 4, 10, 2, 4, 4, 9, 2, 6, 2, 7, 7, 4, 2, 13, 5, 7, 4, 7, 2, 9, 4, 9, 4, 4, 2, 9, 2, 4, 7, 16, 4, 6, 2, 7, 4, 6, 2, 12, 2, 4, 7, 7, 4, 6, 2, 13, 11, 4, 2, 9, 4, 4, 4, 9, 2, 9, 4, 7, 4, 4, 4, 15, 2, 7, 7, 10

Offset

1,2

Comments

a(n) is the logarithm to the base 2 of the denominator of the Dirichlet series of zeta(s)^(1/4). For details, see A256691.

Links

Wolfgang Hintze, Table of n, a(n) for n = 1..500

Formula

2^a(n) = A256691(n).

Crossrefs

Cf. A046645 (k = 2, log_2), A257089 (k = 3, log_3), A257090 (k = 4, log_2), A257091 (k = 5, log_5).

Sequence in context: A254176 A371012 A340839 * A360910 A339664 A124316

Adjacent sequences: A257087 A257088 A257089 * A257091 A257092 A257093

Keyword

nonn

Author

Wolfgang Hintze, Apr 16 2015

Status

approved