OFFSET
1,2
COMMENTS
Only numbers that occur just once are the powers of two (A000079).
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..10081
PROG
(Scheme, with Antti Karttunen's IntSeq-library)
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, May 01 2014
STATUS
approved