A129614 a(n) is the smallest natural number m such that 3^(3^k) + m is prime for k=0,1,...,n.

2, 2, 4, 16, 346, 390410, 390410, 34712918410, 40501164004

Offset: 0

Author

Farideh Firoozbakht, May 13 2007, Jun 01 2007

Keywords

• hard
• more
• nonn

Comments

Next term is greater than 2*10^8.

Examples

			For k=0,1,...,6 3^3^k + 390410 are prime and 390410 is the smallest number with this property so a(6)=390410.
		

Crossrefs

Cf. A129613, A129615.