A165448 Product of prime numbers between 2^n+1 and 2^(n+1), inclusive.

2, 3, 35, 143, 6678671, 584803025179, 34227405074603836560875299, 16008643688606125328574585946049488062084747136988251, 497369008478585535856296246658391242478488212329477774761792556414828431057586895468763959997722781406315137061

Offset: 0

Author

Jaume Oliver Lafont, Sep 20 2009

Keywords

• nonn

Comments

a(1)+1, a(2)+1 and a(3)+1 are squares.

Crossrefs

Cf. A000040, A000079, A157625.

Programs

Mathematica

Table[Times@@Prime[Range[PrimePi[2^n]+1,PrimePi[2^(n+1)]]],{n,0,8}] (* Harvey P. Dale, Jul 20 2019 *)

PARI

a(n)=prod(i=2^n+1,2^(n+1),if(isprime(i),i,1))