OFFSET
1,1
MATHEMATICA
Select[Range[100], PrimeOmega[2^#+5^#]==2&] (* James C. McMahon, Oct 26 2024 *)
PROG
(Magma)IsSemiprime:=func< n|&+[ k[2]: k in Factorization(n)] eq 2 >; [ n: n in [2..100]|IsSemiprime(2^n+5^n)]; // Vincenzo Librandi, Dec 16 2010
CROSSREFS
KEYWORD
nonn,easy,changed
AUTHOR
Zak Seidov, Oct 19 2006
EXTENSIONS
a(14)-a(15) from D. S. McNeil, Dec 20 2010
a(16)-a(18) from Sean A. Irvine, Nov 13 2024
STATUS
approved