A081546 Smallest prime which is 1 more than the product of n (not necessarily distinct) composite numbers.

2, 5, 17, 97, 257, 3457, 12289, 40961, 65537, 786433, 5308417, 14155777, 104857601, 167772161, 1811939329, 3221225473, 24159191041, 77309411329, 206158430209, 2061584302081, 2748779069441, 6597069766657, 39582418599937

Offset: 0

Author

Amarnath Murthy, Apr 01 2003

Keywords

• hard
• nonn

Examples

			a(0) = 1 + 1 = 2, a(3) = 4*4*6 + 1 = 97.
		

Crossrefs

Cf. A081545.

Extensions

More terms from Michel ten Voorde Jun 13 2003

Added missing term 12289 and a(13)-a(22) from Donovan Johnson, Nov 05 2009