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A063426
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Smallest power of 2 having just n 2's in its decimal representation.
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1
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2, 1, 18, 43, 41, 93, 81, 107, 125, 177, 174, 196, 200, 197, 280, 265, 320, 348, 330, 481, 492, 486, 314, 449, 535, 509, 505, 616, 686, 742, 577, 598, 743, 788, 991, 885, 941, 810, 987, 934, 963, 970, 1165, 1018, 984, 1125, 928, 1279, 1126, 1232, 1164
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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LINKS
| Harry J. Smith, Table of n, a(n) for n=0,...,150
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MATHEMATICA
| a = {}; Do[k = 1; While[ Count[ IntegerDigits[2^k], 2] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a
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PROG
| (PARI) Count(x, d)= { local(c, f); c=0; while (x>9, f=x-10*(x\10); if (f==d, c++); x\=10); if (x==d, c++); return(c) } { for (n=0, 150, p=1; while (Count(2^p, 2) != n, p++); write("b063426.txt", n, " ", p) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 23 2009]
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CROSSREFS
| Sequence in context: A013077 A089512 A089014 * A181870 A070890 A123907
Adjacent sequences: A063423 A063424 A063425 * A063427 A063428 A063429
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KEYWORD
| base,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 10 2001
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