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A044518
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Numbers n such that string 5,5 occurs in the base 6 representation of n but not of n+1.
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1
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35, 71, 107, 143, 179, 215, 251, 287, 323, 359, 395, 431, 467, 503, 539, 575, 611, 647, 683, 719, 755, 791, 827, 863, 899, 935, 971, 1007, 1043, 1079, 1115, 1151, 1187, 1223, 1295, 1331, 1367, 1403, 1439, 1475, 1511, 1547, 1583
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| A 6-automatic set: membership is determined by comparing the base-6 representation of the number to the regular expression /5?([^5]+5)*([^45]|[^5]4)55+/. [Charles R Greathouse IV, Feb 11 2012]
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 1..500
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MATHEMATICA
| f[n_]:=Length[StringPosition[ToString[FromDigits[IntegerDigits[n, 6]]], "55", 1]]; Select[Table[n, {n, 2000}], f[#]>0&&f[#+1]==0&] (* Vincenzo Librandi, Feb 11 2012 *)
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CROSSREFS
| Sequence in context: A043390 A031481 A044137 * A039382 A043205 A043985
Adjacent sequences: A044515 A044516 A044517 * A044519 A044520 A044521
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KEYWORD
| nonn,base,easy,changed
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AUTHOR
| Clark Kimberling (ck6(AT)evansville.edu)
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