A044248 Numbers k such that string 7,5 occurs in the base 8 representation of k but not of k-1.

61, 125, 189, 253, 317, 381, 445, 488, 509, 573, 637, 701, 765, 829, 893, 957, 1000, 1021, 1085, 1149, 1213, 1277, 1341, 1405, 1469, 1512, 1533, 1597, 1661, 1725, 1789, 1853, 1917, 1981, 2024, 2045, 2109, 2173, 2237, 2301

Offset

1,1

Links

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

Mathematica

A044248Q[k_] := StringContainsQ[IntegerString[k, 8], "75"] && StringFreeQ[IntegerString[k - 1, 8], "75"];
Select[Range[5000], A044248Q] (* Paolo Xausa, Sep 03 2025 *)

Crossrefs

Sequence in context: A197719 A140372 A142512 * A044629 A283425 A142065

Adjacent sequences: A044245 A044246 A044247 * A044249 A044250 A044251

Keyword

nonn,base

Author

Clark Kimberling

Status

approved