A044276 Numbers n such that string 2,7 occurs in the base 9 representation of n but not of n-1.

25, 106, 187, 225, 268, 349, 430, 511, 592, 673, 754, 835, 916, 954, 997, 1078, 1159, 1240, 1321, 1402, 1483, 1564, 1645, 1683, 1726, 1807, 1888, 1969, 2025, 2131, 2212, 2293, 2374, 2412, 2455, 2536, 2617, 2698, 2779, 2860

Offset

1,1

Links

Table of n, a(n) for n=1..40.

Mathematica

Select[Range[3000], MemberQ[Partition[IntegerDigits[#, 9], 2, 1], {2, 7}]&&!MemberQ[ Partition[ IntegerDigits[#-1, 9], 2, 1], {2, 7}]&]  (* Harvey P. Dale, Sep 30 2011 *)
SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {2, 7}]>0, 1, 0], {n, 3000}], {0, 1}][[;; , 2]] (* Harvey P. Dale, Mar 19 2023 *)

Crossrefs

Sequence in context: A114254 A042222 A158551 * A044657 A160437 A050589

Adjacent sequences: A044273 A044274 A044275 * A044277 A044278 A044279

Keyword

nonn,base

Author

Clark Kimberling

Status

approved