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Search: id:A063430
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| A063430 |
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Smallest power of 2 having just n 4's in its decimal representation. |
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+0
1
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| 1, 2, 18, 22, 64, 91, 117, 111, 164, 138, 182, 233, 219, 253, 343, 266, 264, 321, 315, 331, 450, 349, 451, 469, 553, 504, 510, 687, 592, 630, 710, 744, 808, 767, 828, 889, 722, 951, 789, 942, 918, 964, 1066, 1033, 890, 1183, 1263, 1171, 1229, 1130, 1291
(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], 4] != 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, 4) != n, p++); write("b063430.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: A022371 A092587 A015787 this_sequence A031104 A115042 A098561
Adjacent sequences: A063427 A063428 A063429 this_sequence A063431 A063432 A063433
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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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