OFFSET
1,1
COMMENTS
a(n)=2 whenever A165767(n) is even.
LINKS
Max Alekseyev, Table of n, a(n) for n = 1..39
EXAMPLE
17377902756647509 is in this sequence because it is the smallest prime factor of the semiprime 2^199-199.
CROSSREFS
KEYWORD
nonn
AUTHOR
M. F. Hasler, Oct 08 2009
EXTENSIONS
More terms from Max Alekseyev, Dec 13 2011
STATUS
approved