A043122 - OEIS

A043122

Numbers k such that 1 and 3 occur juxtaposed in the base-6 representation of k but not of k-1.

9, 19, 45, 54, 81, 91, 114, 127, 153, 163, 189, 199, 225, 235, 261, 270, 297, 307, 324, 369, 379, 405, 415, 441, 451, 477, 486, 513, 523, 546, 559, 585, 595, 621, 631, 657, 667, 684, 729, 739, 762, 775, 801, 811, 837, 847, 873

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..47.

MATHEMATICA

Select[Range[900], MemberQ[Sort/@Partition[IntegerDigits[#, 6], 2, 1], {1, 3}] && !MemberQ[Sort/@Partition[IntegerDigits[#-1, 6], 2, 1], {1, 3}]&] (* Harvey P. Dale, Sep 20 2011 *)

CROSSREFS

Cf. A007092.

Sequence in context: A014005 A286624 A058510 * A043902 A048696 A046103

Adjacent sequences: A043119 A043120 A043121 * A043123 A043124 A043125

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved