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Search: id:A087886
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| A087886 |
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Numbers n such that 29^n +2 is prime. |
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+0
7
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| 0, 1, 3, 63, 87, 189, 239, 605, 2099, 3667, 5029
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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Next term after 5029 is greater than 10000. - Ryan Propper (rpropper(AT)stanford.edu), Jul 03 2005
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EXAMPLE
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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.
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PROGRAM
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(PARI) for( n = 0, 239, if( isprime( 29^n +2), print( n), ))
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CROSSREFS
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Cf. A051783, n such that 3^n +2 is prime.
Cf. A087885, 5^n +2 is prime.
Adjacent sequences: A087883 A087884 A087885 this_sequence A087887 A087888 A087889
Sequence in context: A104403 A144422 A135444 this_sequence A123754 A048354 A046181
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KEYWORD
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easy,more,nonn
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AUTHOR
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Donald S. McDonald (don.mcdonald(AT)paradise.net.nz), Oct 13 2003
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EXTENSIONS
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One extra term from Mark Hudson (mrmarkhudson(AT)hotmail.com), Sep 07 2004
3 additional terms, corresponding to probable primes, from Ryan Propper (rpropper(AT)stanford.edu), Jul 03 2005
Edited by T. D. Noe (noe(AT)sspectra.com), Oct 30 2008
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