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A061785 a(n) = m such that 2^m < 5^n < 2^(m+1). 3
2, 4, 6, 9, 11, 13, 16, 18, 20, 23, 25, 27, 30, 32, 34, 37, 39, 41, 44, 46, 48, 51, 53, 55, 58, 60, 62, 65, 67, 69, 71, 74, 76, 78, 81, 83, 85, 88, 90, 92, 95, 97, 99, 102, 104, 106, 109, 111, 113, 116, 118, 120, 123, 125, 127, 130, 132, 134, 136, 139, 141, 143, 146, 148 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..64.

EXAMPLE

a(2)=4 since 2^4 < 5^2 < 2^(4+1).

PROG

(PARI) a(n) = floor(n*log(5)/log(2)) \\ Michel Marcus, Jul 27 2013

CROSSREFS

Cf. A020858.

Sequence in context: A059545 A187339 A292649 * A330118 A047292 A189930

Adjacent sequences:  A061782 A061783 A061784 * A061786 A061787 A061788

KEYWORD

nonn

AUTHOR

Lekraj Beedassy, May 09 2003

EXTENSIONS

Corrected and extended by John W. Layman, May 09 2003

STATUS

approved

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Last modified August 3 20:08 EDT 2020. Contains 336201 sequences. (Running on oeis4.)