OFFSET
0,1
COMMENTS
a(1)+1, a(2)+1 and a(3)+1 are squares.
MATHEMATICA
Table[Times@@Prime[Range[PrimePi[2^n]+1, PrimePi[2^(n+1)]]], {n, 0, 8}] (* Harvey P. Dale, Jul 20 2019 *)
PROG
(PARI) a(n)=prod(i=2^n+1, 2^(n+1), if(isprime(i), i, 1))
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaume Oliver Lafont, Sep 20 2009
STATUS
approved