A044342 Numbers k such that the string 1,0 occurs in the base 10 representation of k but not of k-1.

10, 100, 210, 310, 410, 510, 610, 710, 810, 910, 1000, 1210, 1310, 1410, 1510, 1610, 1710, 1810, 1910, 2010, 2100, 2210, 2310, 2410, 2510, 2610, 2710, 2810, 2910, 3010, 3100, 3210, 3310, 3410, 3510, 3610, 3710, 3810, 3910, 4010, 4100, 4210, 4310, 4410, 4510, 4610, 4710

Offset

1,1

Links

Paolo Xausa, Table of n, a(n) for n = 1..10000

Mathematica

A044342Q[k_] := StringContainsQ[IntegerString[k], "10"] && StringFreeQ[IntegerString[k - 1], "10"];
Select[Range[5000], A044342Q] (* Paolo Xausa, Nov 03 2025 *)

Crossrefs

Sequence in context: A101655 A078259 A043216 * A119052 A029774 A208375

Adjacent sequences: A044339 A044340 A044341 * A044343 A044344 A044345

Keyword

nonn,base

Author

Clark Kimberling

Extensions

More terms from Paolo Xausa, Nov 03 2025

Status

approved