A087738 Square array: T(n,k) gives n-th number a such that a^(2^k)+1 is prime (a generalized Fermat).

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

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