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A063577 Smallest k such that 4^k has exactly n 2's in its decimal representation. 1
1, 4, 9, 25, 36, 54, 45, 56, 68, 106, 87, 98, 100, 203, 140, 154, 160, 174, 165, 263, 246, 243, 157, 234, 276, 280, 338, 308, 343, 371, 335, 299, 427, 394, 497, 475, 473, 405, 524, 467, 577, 485, 586, 509, 492, 644, 464, 677, 563, 616, 582 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

MATHEMATICA

a = {}; Do[k = 1; While[ Count[ IntegerDigits[4^k], 2] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a

CROSSREFS

Sequence in context: A111245 A062503 A248648 * A087058 A046659 A063760

Adjacent sequences:  A063574 A063575 A063576 * A063578 A063579 A063580

KEYWORD

base,nonn

AUTHOR

Robert G. Wilson v, Aug 10 2001

EXTENSIONS

Name corrected by Jon E. Schoenfield, Jun 26 2018

STATUS

approved

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Last modified July 5 04:05 EDT 2020. Contains 335459 sequences. (Running on oeis4.)