A378719 Numbers k for which k/w = 3/4, where w is the number of numbers in the range {1..k} containing at least one decimal digit 1.
19131872, 20809344, 20811488, 21257636, 22732948, 172186880, 1549681952, 2870345516, 2870345520, 2871907160, 2872143356, 2872251248, 13947137600, 125524238432, 496384984980, 516044091344, 530010360824, 530030555544, 530031618464, 530032461188, 530163415832, 530260860088
Offset: 1
Links
- Karl-Heinz Hofmann and Hugo Pfoertner, Table of n, a(n) for n = 1..37
- IBM Research, Counting numbers with specific digits, Ponder This Challenge December 2024, with a bonus question asking for the last term a(37) of this sequence.
- Hugo Pfoertner, PARI program (2025).
- Karl-Heinz Hofmann, Python program.
- Karl-Heinz Hofmann, Graph zoom to a(8) and a(9) (animated gif).
- Karl-Heinz Hofmann, Whole Graph up to a(37) (then diverging) .
Programs
-
PARI
\\ See link
-
Python
# See link