A044202 Numbers k such that string 1,7 occurs in the base 8 representation of k but not of k-1.

15, 79, 120, 143, 207, 271, 335, 399, 463, 527, 591, 632, 655, 719, 783, 847, 911, 960, 1039, 1103, 1144, 1167, 1231, 1295, 1359, 1423, 1487, 1551, 1615, 1656, 1679, 1743, 1807, 1871, 1935, 1999, 2063, 2127, 2168, 2191, 2255, 2319, 2383, 2447, 2511, 2575, 2639, 2680

Offset

1,1

Links

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

Mathematica

A044202Q[k_] := StringContainsQ[IntegerString[k, 8], "17"] && StringFreeQ[IntegerString[k - 1, 8], "17"];
Select[Range[5000], A044202Q] (* Paolo Xausa, Sep 04 2025 *)

Crossrefs

Cf. A007094.

Sequence in context: A081591 A269620 A269436 * A044583 A212746 A212741

Adjacent sequences: A044199 A044200 A044201 * A044203 A044204 A044205

Keyword

nonn,base

Author

Clark Kimberling

Extensions

More terms from Paolo Xausa, Sep 04 2025

Status

approved