A084713 Smallest prime of the form (2n-1)^k + 2, or 0 if no such number exists.

3, 5, 7, 0, 11, 13, 0, 17, 19, 0, 23, 952809757913929, 0, 29, 31, 0, 1091, 37, 0, 41, 43, 0, 47

Offset: 1

Author

Amarnath Murthy, Jun 10 2003

Keywords

• nonn

Comments

a(3n+1) = 0, a(24) = 47^113 - 2 is a 189-digit number.

Examples

			a(12) = 952809757913927 = 23^11 + 2.
		

Crossrefs

Cf. A084714.

Extensions

Edited by Robert G. Wilson v, Jun 11 2003