A044381 Numbers n such that string 4,9 occurs in the base 10 representation of n but not of n-1.

49, 149, 249, 349, 449, 490, 549, 649, 749, 849, 949, 1049, 1149, 1249, 1349, 1449, 1490, 1549, 1649, 1749, 1849, 1949, 2049, 2149, 2249, 2349, 2449, 2490, 2549, 2649, 2749, 2849, 2949, 3049, 3149, 3249, 3349, 3449, 3490

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {4, 9}]>0, 1, 0], {n, 3500}], {0, 1}][[;; , 2]] (* Harvey P. Dale, Dec 24 2023 *)

Crossrefs

Sequence in context: A045897 A162942 A027469 * A044762 A159247 A265423

Adjacent sequences: A044378 A044379 A044380 * A044382 A044383 A044384

Keyword

nonn,base

Author

Clark Kimberling

Status

approved