A044173 - OEIS

A044173

Numbers n such that string 5,0 occurs in the base 7 representation of n but not of n-1.

35, 84, 133, 182, 231, 245, 280, 329, 378, 427, 476, 525, 574, 588, 623, 672, 721, 770, 819, 868, 917, 931, 966, 1015, 1064, 1113, 1162, 1211, 1260, 1274, 1309, 1358, 1407, 1456, 1505, 1554, 1603, 1617, 1652, 1701, 1715, 1799

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..42.

MATHEMATICA

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 7], {5, 0}]>0, 1, 0], {n, 2000}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Sep 06 2018 *)

CROSSREFS

Sequence in context: A111144 A267555 A201632 * A044554 A156126 A119691

Adjacent sequences: A044170 A044171 A044172 * A044174 A044175 A044176

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved