OFFSET

1,2

COMMENTS

This sequence differs from A061955 in that all least significant zeros are removed before concatenation.

No more terms < 10^7. - Lars Blomberg, Aug 31 2011

EXAMPLE

7 is in the sequence as the left concatenation of numbers <= 7 is 7654321 which gives 7654321 -> (111)(011)(101)(001)(11)(01)(1) base 2 -> 1111110111111_2 = 8127, and 7 divides 8127.

MATHEMATICA

b = 2; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[IntegerDigits[IntegerReverse[#, b], b], c], b], #] &] (* Robert Price, Mar 13 2020 *)

PROG

(J) mkcat =: 13 : 'y +. #. ; #:&.> |.&.#:&.> |. >:i. y'

(#~ (= mkcat"0)) >:i. 100x NB. Stephen Makdisi, May 03 2018

CROSSREFS

KEYWORD

nonn,base,more

AUTHOR

EXTENSIONS

Edited and updated by Larry Reeves (larryr(AT)acm.org), Apr 12 2002

Additional comments and example from Larry Reeves (larryr(AT)acm.org), May 25 2001

Terms verified by Rick L. Shepherd, Feb 24 2009

1 more term from Sean A. Irvine, Oct 04 2009

STATUS

approved