A029490 - OEIS

A029490

Numbers k that divide the (left) concatenation of all numbers <= k written in base 21 (most significant digit on left).

1, 5, 25, 43, 55, 128, 275, 1280, 2816, 5888, 6400, 12800, 28160, 33413, 37376, 129919, 140800, 286025, 352000, 990845, 1050880, 1773725, 2848000, 3581033, 4343680, 4428160, 5624960, 6732160, 7553920, 8497280, 9249995, 9872000, 10938752, 11426176, 14558575, 14569600, 15368320, 18998705, 19312000, 21362275, 24208000, 24934855, 27632000, 32432000, 37022605, 43193216, 51382265, 53717375, 81016375

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

a(62) > 3*10^10. - Jason Yuen, Jun 29 2024

LINKS

Jason Yuen, Table of n, a(n) for n = 1..61

Index entries for related sequences

MATHEMATICA

b = 21; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[IntegerDigits[#, b], c], b], #] &] (* Robert Price, Mar 12 2020 *)

CROSSREFS