0,3

Next term is greater than 3*10^8.

For k=0,1,...,5 4^4^k + 106908087 are prime and 106908087 is the smallest number with this property so a(5)=106908087.

Cf. A129613, A129614.

Sequence in context: A035274 A145409 A164323 this_sequence A069990 A157581 A143001

Adjacent sequences: A129612 A129613 A129614 this_sequence A129616 A129617 A129618

hard,more,nonn

Farideh Firoozbakht (mymontain(AT)yahoo.com), May 13 2007