A085873 a(1) = 2; a(n)= smallest prime of the form k*a(n-1) + 1 where k itself is a multiple of n.

2, 5, 31, 373, 22381, 134287, 3760037, 481284737, 25989375799, 6237450191761, 411671712656227, 64220787174371413, 73468580527480896473, 1028560127384732550623, 185140822929251859112141

Offset: 1

Author

Amarnath Murthy, Jul 07 2003

Keywords

• nonn

Examples

			a(2)= 5 = 2*2 + 1, a(3) = 6*5 + 1, a(4) = 12*31 + 1; 2,6 and 12 are respectively multiples of 2, 3 and 4.
		

Extensions

More terms from Ray Chandler, Jul 08 2003

Corrected by T. D. Noe, Nov 15 2006