A044720 - OEIS

A044720

Numbers n such that string 0,7 occurs in the base 10 representation of n but not of n+1.

107, 207, 307, 407, 507, 607, 707, 807, 907, 1007, 1079, 1107, 1207, 1307, 1407, 1507, 1607, 1707, 1807, 1907, 2007, 2079, 2107, 2207, 2307, 2407, 2507, 2607, 2707, 2807, 2907, 3007, 3079, 3107, 3207, 3307, 3407, 3507

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..38.

MATHEMATICA

SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {0, 7}]>0, 1, 0], {n, 4000}], {1, 0}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Sep 22 2016 *)

CROSSREFS

Sequence in context: A250147 A142270 A044339 * A134297 A141996 A142844

Adjacent sequences: A044717 A044718 A044719 * A044721 A044722 A044723

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved