OFFSET
1,1
EXAMPLE
6 is OK because 11^6 + 6^11 = 1771561 + 362797056 = 364568617 = 7*52081231(semiprime).
PROG
(Magma) IsSemiprime:=func< n | &+[ k[2]: k in Factorization(n) ] eq 2 >; [ n: n in [1..70]|IsSemiprime(11^n+n^11)] // [Vincenzo Librandi, Dec 16 2010]
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Feb 22 2006
STATUS
approved