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A102483
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Numbers k such that 2^k contains no zeros in base 3.
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18
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OFFSET
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1,3
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COMMENTS
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I conjectured in 1973 that there are no further terms. This question is still open.
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LINKS
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Eric Weisstein's World of Mathematics, Ternary
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MATHEMATICA
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Select[ Range@1000, FreeQ[ IntegerDigits[2^#, 3], 0] &] (* Robert G. Wilson v, Dec 06 2005 *)
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PROG
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(PARI) for (n=0, 100, if (vecmin(digits(2^n, 3)), print1(n, ", "))) \\ Michel Marcus, Mar 25 2015
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CROSSREFS
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KEYWORD
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nonn,base,hard
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AUTHOR
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STATUS
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approved
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