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Search: id:A063575
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| A063575 |
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Smallest power of 4 having just n 0's in its decimal representation. |
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+0
1
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| 1, 5, 21, 35, 47, 44, 50, 51, 103, 99, 121, 125, 126, 175, 166, 131, 185, 153, 184, 223, 272, 232, 248, 336, 233, 306, 315, 384, 314, 327, 333, 373, 393, 399, 454, 457, 504, 453, 484, 506, 621, 494, 510, 639, 522, 557, 560, 559, 716, 609, 629
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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Harry J. Smith, Table of n, a(n) for n=0,...,150
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MATHEMATICA
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a = {}; Do[k = 1; While[ Count[ IntegerDigits[4^k], 0] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a
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PROGRAM
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(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, a=1; while (Count(4^a, 0) != n, a++); write("b063575.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 26 2009]
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CROSSREFS
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Sequence in context: A006309 A145026 A039561 this_sequence A038844 A147345 A146022
Adjacent sequences: A063572 A063573 A063574 this_sequence A063576 A063577 A063578
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KEYWORD
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base,nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 10 2001
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