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A029490 Numbers k that divide the (left) concatenation of all numbers <= k written in base 21 (most significant digit on left). 0
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
LINKS
MATHEMATICA
b = 21; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[IntegerDigits[#, b], c], b], #] &] (* Robert Price, Mar 12 2020 *)
CROSSREFS
Sequence in context: A293571 A294256 A056872 * A223654 A362092 A098947
KEYWORD
nonn,base
AUTHOR
EXTENSIONS
More terms from Andrew Gacek (andrew(AT)dgi.net), Feb 21 2000
More terms from Larry Reeves (larryr(AT)acm.org), May 24 2001
Edited and updated by Larry Reeves (larryr(AT)acm.org), Apr 12 2002
Thirty more terms from Max Alekseyev, May 15 2011
STATUS
approved

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Last modified February 24 14:24 EST 2024. Contains 370304 sequences. (Running on oeis4.)