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A087738 Square array: T(n,k) gives n-th number a such that a^(2^k)+1 is prime (a generalized Fermat). 0
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 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

Harvey Dubner, J. Recr. Math., 18, 1986.

LINKS

Table of n, a(n) for n=0..70.

Yves Gallot, Generalized Fermat Prime Search.

EXAMPLE

{1}; {2,1}; {4,2,1}; ...

See the well-formed array on Gallot's page.

CROSSREFS

Cf. A056993, A006093, A005574, A000068, A006314, A006313, A006315, A006316, A056994, A056995, A057465, A057002, A088361, A088362.

Sequence in context: A325309 A211956 A128177 * A133113 A124840 A145118

Adjacent sequences:  A087735 A087736 A087737 * A087739 A087740 A087741

KEYWORD

nonn,tabl

AUTHOR

Jeppe Stig Nielsen, Oct 01 2003

STATUS

approved

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Last modified September 26 02:27 EDT 2021. Contains 347664 sequences. (Running on oeis4.)