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Search: id:A063429
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| A063429 |
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Smallest power of 2 having just n 3's in its decimal representation. |
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+0
1
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| 1, 5, 49, 25, 35, 109, 96, 128, 135, 169, 182, 156, 208, 302, 310, 277, 221, 300, 346, 498, 387, 502, 563, 507, 503, 611, 550, 585, 615, 681, 731, 817, 819, 835, 779, 860, 849, 840, 879, 997, 1016, 925, 1066, 1161, 1117, 1186, 1282, 1090, 1293, 1251, 1444
(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[2^k], 3] != 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, p=1; while (Count(2^p, 3) != n, p++); write("b063429.txt", n, " ", p) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 20 2009]
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CROSSREFS
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Sequence in context: A126224 A108207 A127091 this_sequence A007406 A058927 A083224
Adjacent sequences: A063426 A063427 A063428 this_sequence A063430 A063431 A063432
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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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