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A049301
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Numbers k such that k is a substring of 3^k.
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8
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7, 9, 24, 28, 57, 61, 62, 69, 71, 72, 77, 78, 80, 83, 87, 89, 95, 111, 162, 170, 174, 185, 191, 218, 222, 225, 229, 232, 249, 255, 259, 266, 267, 286, 288, 298, 314, 315, 322, 328, 329, 330, 332, 338, 351, 352, 362, 373, 376, 381, 386, 387, 414, 421, 435, 438
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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ssQ[n_]:=MemberQ[Partition[IntegerDigits[3^n], IntegerLength[n], 1], IntegerDigits[ n]]; Select[Range[500], ssQ] (* Harvey P. Dale, Jul 16 2013 *)
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CROSSREFS
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KEYWORD
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nonn,base,easy
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AUTHOR
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STATUS
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approved
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