Paolo Xausa, <a href="/A044323/b044323_1.txt">Table of n, a(n) for n = 1..10000</a>

reviewed

approved

proposed

reviewed

editing

proposed

Numbers n k such that the string 8,0 occurs in the base 9 representation of n k but not of nk-1.

72, 153, 234, 315, 396, 477, 558, 639, 648, 720, 801, 882, 963, 1044, 1125, 1206, 1287, 1368, 1377, 1449, 1530, 1611, 1692, 1773, 1854, 1935, 2016, 2097, 2106, 2178, 2259, 2340, 2421, 2502, 2583, 2664, 2745, 2826, 2835, 2907, 2988, 3069, 3150, 3231, 3312, 3393, 3474

Paolo Xausa, <a href="/A044323/b044323_1.txt">Table of n, a(n) for n = 1..10000</a>

A044323Q[k_] := StringContainsQ[IntegerString[k, 9], "80"] && StringFreeQ[IntegerString[k - 1, 9], "80"];

Select[Range[5000], A044323Q] (* Paolo Xausa, Oct 07 2025 *)

Cf. A007095.

More terms from Paolo Xausa, Oct 07 2025

approved

editing

Clark Kimberling (ck6(AT)evansville.edu)

Clark Kimberling

String Numbers n such that string 8,0 occurs in the base 9 representation of n but not of n-1.

nonn,base,new

nonn,base,new

Clark Kimberling, (ck6(AT)evansville.edu)

String 8,0 occurs in the base 9 representation of n, but not of n-1.

nonn,base,new

Clark Kimberling, ck6@cedar.(AT)evansville.edu

String 8,0 occurs in the base 9 representation of n, but not of n-1.

72, 153, 234, 315, 396, 477, 558, 639, 648, 720, 801, 882, 963, 1044, 1125, 1206, 1287, 1368, 1377, 1449, 1530, 1611, 1692, 1773, 1854, 1935, 2016, 2097, 2106, 2178, 2259, 2340, 2421, 2502, 2583, 2664, 2745, 2826, 2835

1,1

nonn,base

Clark Kimberling, [email protected]

approved