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

1,1

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) .

Prog

(PARI) \\ See link
(Python) # See link

Crossrefs

Cf. A004835, A346685.

Sequence in context: A073033 A251389 A138025 * A184790 A183697 A022248

Adjacent sequences: A378716 A378717 A378718 * A378720 A378721 A378722

Keyword

nonn,base,fini,full

Author

Karl-Heinz Hofmann and Hugo Pfoertner, Dec 05 2024

Status

approved