A044750 Numbers n such that string 3,7 occurs in the base 10 representation of n but not of n+1.

37, 137, 237, 337, 379, 437, 537, 637, 737, 837, 937, 1037, 1137, 1237, 1337, 1379, 1437, 1537, 1637, 1737, 1837, 1937, 2037, 2137, 2237, 2337, 2379, 2437, 2537, 2637, 2737, 2837, 2937, 3037, 3137, 3237, 3337, 3379, 3437

Offset

1,1

Links

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

Mathematica

Transpose[SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {3, 7}]>0, 1, 0], {n, 3500}], {1, 0}]][[1]] (* The program uses the SequencePosition and SequenceCount functions from Mathematica version 10 *) (* Harvey P. Dale, Apr 06 2016 *)

Crossrefs

Sequence in context: A117504 A055783 A044369 * A141936 A244768 A013522

Adjacent sequences: A044747 A044748 A044749 * A044751 A044752 A044753

Keyword

nonn,base

Author

Clark Kimberling

Status

approved