A087886 Numbers n such that 29^n + 2 is prime.

0, 1, 3, 63, 87, 189, 239, 605, 2099, 3667, 5029, 20025, 45285, 99167

Offset: 1

Author

Donald S. McDonald, Oct 13 2003

Keywords

• nonn
• more

Comments

After 0, all terms are odd. [Bruno Berselli, Oct 02 2014]

Examples

			a(1) = 1 is a member because 29^1 + 2 = 31 is prime.
29^3+2 = 24391 is prime, so 3 is in the sequence.
		

Links

• Henri & Renaud Lifchitz, PRP Records.

Crossrefs

Cf. A051783, n such that 3^n +2 is prime.

Cf. A087885, 5^n +2 is prime.

Programs

PARI

for( n = 0,239, if( isprime( 29^n +2), print( n), ))

Extensions

a(8) from Mark Hudson (mrmarkhudson(AT)hotmail.com), Sep 07 2004

a(9) - a(11), corresponding to probable primes, from Ryan Propper, Jul 03 2005

Edited by T. D. Noe, Oct 30 2008

a(12) from Ray Chandler, Aug 01 2011

a(13) from Ray Chandler, Aug 02 2011

a(14) from Ray Chandler, Aug 08 2011