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A025638 Exponent of 2 (value of i) in n-th number of form 2^i*9^j. 1
0, 1, 2, 3, 0, 4, 1, 5, 2, 6, 3, 0, 7, 4, 1, 8, 5, 2, 9, 6, 3, 0, 10, 7, 4, 1, 11, 8, 5, 2, 12, 9, 6, 3, 0, 13, 10, 7, 4, 1, 14, 11, 8, 5, 2, 15, 12, 9, 6, 3, 0, 16, 13, 10, 7, 4, 1, 17, 14, 11, 8, 5, 2, 18, 15, 12, 9, 6, 3, 19, 0, 16, 13, 10, 7, 4, 20, 1, 17, 14, 11, 8, 5, 21, 2, 18, 15, 12, 9, 6, 22 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

N:= 10^8: # for 2^i*9^j <= N

B:= sort([seq(seq(2^i*9^j, i=0..ilog2(N/9^j)), j=0..floor(log[9](N)))]):

map(padic:-ordp, B, 2); # Robert Israel, Jun 08 2018

CROSSREFS

Cf. A025611.

Sequence in context: A277141 A021438 A195822 * A215591 A025639 A195827

Adjacent sequences:  A025635 A025636 A025637 * A025639 A025640 A025641

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified May 22 09:50 EDT 2022. Contains 353949 sequences. (Running on oeis4.)