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A257090 a(n) = log_2 (A256691(n)). 3
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 (list; graph; refs; listen; history; text; internal format)
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: A108053 A133501 A254176 * A124316 A061034 A245635

Adjacent sequences:  A257087 A257088 A257089 * A257091 A257092 A257093

KEYWORD

nonn

AUTHOR

Wolfgang Hintze, Apr 16 2015

STATUS

approved

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Last modified January 18 13:34 EST 2019. Contains 319271 sequences. (Running on oeis4.)