|
%I #14 Feb 10 2018 13:39:57
%S 1,3,21,105,4305,21525,5316675,3291021825,38046409656325181475
%N a(1) = 1. a(n) = the smallest positive multiple of a(n-1) with exactly n 1's in its binary representation.
%C Each term is odd.
%C a(10) = 2^617 + 2^529 + 2^527 + 2^401 + 2^352 + 2^284 + 2^240 + 2^239 + 2^154 + 1 has 186 decimal digits. - _Max Alekseyev_, Feb 04 2018
%C The sequence is infinite. - _Max Alekseyev_, Feb 04 2018
%H Max Alekseyev, <a href="/A140451/b140451.txt">Table of n, a(n) for n = 1..10</a>
%K base,nonn
%O 1,2
%A _Leroy Quet_, Jul 21 2008
%E First 8 terms calculated by _R. J. Mathar_ and _Jack Brennen_.
%E a(9) from _Max Alekseyev_, Jul 22 2008
| 