1,1

Table of n, a(n) for n=1..4.

Carlos Rivera, Puzzle 974. More twins like these..., The Prime Puzzles & Problems Connection.

3*5 = 15; 15-2 and 15+2 are primes.

pp=1; lst={}; Do[p=Prime[n]; pp*=p; If[PrimeQ[pp-2]&&PrimeQ[pp+2], Print[Date[], p]; AppendTo[lst, p]], {n, 2, 4!}]; lst

Cf. A070826, A178641, A178642.

Intersection of A096177 and A096547.

Sequence in context: A090610 A230115 A182342 * A241859 A293059 A179625

Adjacent sequences: A178645 A178646 A178647 * A178649 A178650 A178651

nonn,more

Vladimir Joseph Stephan Orlovsky, May 31 2010

approved