OFFSET
1,1
FORMULA
The even terms of A092559 divided by 2. - Max Alekseyev, Jan 04 2024
EXAMPLE
14 is in this sequence because 4^14+1 = 17*15790321 is a semiprime.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Sean A. Irvine, Oct 16 2023
EXTENSIONS
a(19)-a(21) from Max Alekseyev, Jan 04 2024
STATUS
approved