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A044401 Numbers n such that string 6,9 occurs in the base 10 representation of n but not of n-1. 0
69, 169, 269, 369, 469, 569, 669, 690, 769, 869, 969, 1069, 1169, 1269, 1369, 1469, 1569, 1669, 1690, 1769, 1869, 1969, 2069, 2169, 2269, 2369, 2469, 2569, 2669, 2690, 2769, 2869, 2969, 3069, 3169, 3269, 3369, 3469, 3569 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..39.

MATHEMATICA

Select[Range[4000], MemberQ[Partition[IntegerDigits[#], 2, 1], {6, 9}] && !MemberQ[Partition[IntegerDigits[#-1], 2, 1], {6, 9}]&] (* Harvey P. Dale, Jul 20 2011 *)

CROSSREFS

Sequence in context: A118215 A033672 A020198 * A044782 A020296 A259637

Adjacent sequences:  A044398 A044399 A044400 * A044402 A044403 A044404

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified May 21 08:53 EDT 2019. Contains 323441 sequences. (Running on oeis4.)