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A061931 Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 2 (most significant digit on right). 142

%I

%S 1,3,7,39,63,523,4983,25007,892217,1142775,1381311,1751751

%N Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 2 (most significant digit on right).

%C This sequence differs from A029495 in that all least significant zeros are removed before concatenation.

%C No more terms < 10^7. [_Lars Blomberg_, Oct 17 2011]

%H <a href="/index/N#concat">Index entries for related sequences</a>

%e 1234567 -> (1)(01)(11)(001)(101)(011)(111) base 2 -> 1111110111111 base 2 = 8127 and 7 divides 8127.

%Y Cf. A029447-A029470, A029471-A029494, A029495-A029518, A029519-A029542, A061931-A061954, A061955-A061978.

%K nonn,base,more

%O 1,2

%A Larry Reeves (larryr(AT)acm.org), May 24 2001

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

%E a(9)-a(12) from _Lars Blomberg_, Oct 17 2011

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Last modified February 23 18:54 EST 2019. Contains 320438 sequences. (Running on oeis4.)