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A087738
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Square array: a(n,k) gives n-th number a such that a^(2^k)+1 is prime (a generalized Fermat).
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0
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1, 2, 1, 4, 2, 1, 6, 4, 2, 1, 10, 6, 4, 2, 1, 12, 10, 6, 4, 2, 1, 16, 14, 16, 118, 44, 30, 1, 18, 16, 20, 132, 74, 54, 102, 1, 22, 20, 24, 140, 76, 96, 162, 120, 1, 28, 24, 28, 152, 94, 112, 274, 190, 278, 1, 30, 26, 34, 208, 156, 114, 300, 234, 614, 46, 1, 36, 36, 46, 240, 158
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OFFSET
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0,2
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REFERENCES
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Harvey Dubner, J. Recr. Math., 18, 1986.
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LINKS
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Table of n, a(n) for n=0..70.
Yves Gallot, Generalized Fermat Prime Search.
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EXAMPLE
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{1}; {2,1}; {4,2,1}; ...
See the well-formed array on Gallot's page.
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CROSSREFS
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Cf. A056993, A088362, A088361, A057002, A057465, A056995, A056994.
Sequence in context: A147542 A211956 A128177 * A133113 A124840 A145118
Adjacent sequences: A087735 A087736 A087737 * A087739 A087740 A087741
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KEYWORD
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nonn,tabl
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AUTHOR
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Jeppe Stig Nielsen (mail(AT)jeppesn.dk), Oct 01 2003
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STATUS
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approved
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