

A063587


Smallest k such that 5^k has exactly n 2's in its decimal representation.


0



1, 2, 11, 13, 28, 25, 46, 53, 64, 66, 85, 100, 97, 115, 116, 148, 145, 107, 139, 184, 175, 209, 199, 274, 276, 251, 232, 244, 342, 250, 329, 339, 312, 375, 354, 332, 394, 351, 419, 362, 453, 415, 484, 517, 509, 468, 550, 541, 496, 522, 504
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OFFSET

0,2


LINKS

Table of n, a(n) for n=0..50.


MATHEMATICA

a = {}; Do[k = 1; While[ Count[ IntegerDigits[5^k], 2] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a


CROSSREFS

Sequence in context: A247338 A154742 A257329 * A038972 A242776 A105887
Adjacent sequences: A063584 A063585 A063586 * A063588 A063589 A063590


KEYWORD

base,nonn


AUTHOR

Robert G. Wilson v, Aug 10 2001


EXTENSIONS

Name corrected by Jon E. Schoenfield, Jun 26 2018


STATUS

approved



