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A186112
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Numbers n such that 3*6^n + 1 is prime.
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1
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1, 2, 4, 6, 7, 8, 11, 15, 26, 29, 50, 66, 122, 225, 272, 275, 308, 390, 992, 1201, 2520, 15812, 17419, 29328, 41852
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OFFSET
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1,2
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COMMENTS
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The primes produced by these values of n are in A186105.
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LINKS
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Table of n, a(n) for n=1..25.
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EXAMPLE
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15 is in the sequence because 3*6^15+1=1410554953729 is prime.
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PROG
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(PARI) select(n->ispseudoprime(3*6^n+1), vector(10^4, i, i)) \\ Charles R Greathouse IV, Feb 13 2011
(PFGW) ABC2 3*6^$a+1
a: from 1 to 50000
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CROSSREFS
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Sequence in context: A092054 A334573 A228370 * A029453 A330943 A014855
Adjacent sequences: A186109 A186110 A186111 * A186113 A186114 A186115
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KEYWORD
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nonn
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AUTHOR
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Gilbert Mozzo, Feb 12 2011
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EXTENSIONS
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a(14), a(15), a(17) added by D. S. McNeil, Feb 12 2011
a(20)-a(25) from Charles R Greathouse IV, Feb 13 2011 to Feb 14 2011
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STATUS
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approved
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