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 A033001 Every run of digits of n in base 3 has length 2. 31
 4, 8, 36, 44, 72, 76, 328, 332, 396, 400, 652, 656, 684, 692, 2952, 2960, 2988, 2992, 3568, 3572, 3600, 3608, 5868, 5876, 5904, 5908, 6160, 6164, 6228, 6232, 26572, 26576, 26640, 26644, 26896, 26900, 26928, 26936, 32112, 32120 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS See A043291 for the base 2 version (which has a very simple formula), A033002 - A033014 for bases 4 through 16, A033015 - A033029 for the variants with runs of length >= 2. - M. F. Hasler, Feb 01 2014 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..250 FORMULA a(n)=4*A043307(n). - M. F. Hasler, Feb 01 2014 MATHEMATICA Select[Range[10000], Union[Length/@Split[IntegerDigits[#, 3]]]=={2}&] (* Vincenzo Librandi, Feb 05 2014 *) PROG From M. F. Hasler, Feb 01 2014 (Start) (PARI) is_A033001(n)=!until(!n\=9, bittest(4588304, n%27)||return) (PARI) for(n=1, 9999, is_A033001(n)&&print1(n", ")) \\ (End) CROSSREFS Sequence in context: A158863 A074736 A044829 * A269012 A149110 A149111 Adjacent sequences:  A032998 A032999 A033000 * A033002 A033003 A033004 KEYWORD nonn,base AUTHOR STATUS approved

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Last modified October 14 12:02 EDT 2019. Contains 328004 sequences. (Running on oeis4.)