A044377 Numbers n such that string 4,5 occurs in the base 10 representation of n but not of n-1.

45, 145, 245, 345, 445, 450, 545, 645, 745, 845, 945, 1045, 1145, 1245, 1345, 1445, 1450, 1545, 1645, 1745, 1845, 1945, 2045, 2145, 2245, 2345, 2445, 2450, 2545, 2645, 2745, 2845, 2945, 3045, 3145, 3245, 3345, 3445, 3450

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1250

Mathematica

Flatten[Position[Partition[If[MemberQ[Partition[IntegerDigits[#], 2, 1], {4, 5}], 1, 0]&/@Range[3500], 2, 1], {0, 1}]]+1 (* Harvey P. Dale, Aug 14 2014 *)

Crossrefs

Sequence in context: A131011 A336507 A156370 * A044758 A053743 A347874

Adjacent sequences: A044374 A044375 A044376 * A044378 A044379 A044380

Keyword

nonn,base

Author

Clark Kimberling

Status

approved