%I #17 Aug 22 2020 09:43:17
%S 1,2,4,8,16,8192,16777216,67108864
%N Ulam numbers that are powers of 2.
%C There are no other terms < 2^24. - _Jud McCranie_, Feb 12 2003
%C From _Amiram Eldar_, Aug 22 2020: (Start)
%C a(9) > 2^31.
%C The corresponding exponents of 2 are 0, 1, 2, 3, 4, 13, 24, 26, ...
%C The corresponding indices of Ulam numbers are 1, 2, 4, 6, 9, 694, 1241891, 4964116, ... (End)
%H <a href="/index/Di#divseq">Index to divisibility sequences</a>
%Y Intersection of A000079 and A002858.
%K nonn,more
%O 1,2
%A _Naohiro Nomoto_, Mar 29 2002
%E a(7)-a(8) from _Amiram Eldar_, Aug 22 2020