

A087886


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


7



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

1,3


COMMENTS

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


LINKS

Table of n, a(n) for n=1..14.
Henri & Renaud Lifchitz, PRP Records.


EXAMPLE

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.


PROG

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


CROSSREFS

Cf. A051783, n such that 3^n +2 is prime.
Cf. A087885, 5^n +2 is prime.
Sequence in context: A144422 A135444 A182468 * A123754 A048354 A046181
Adjacent sequences: A087883 A087884 A087885 * A087887 A087888 A087889


KEYWORD

nonn,more


AUTHOR

Donald S. McDonald, Oct 13 2003


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


STATUS

approved



