A138888 Non-Fermat numbers.

1, 2, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73

Offset

1,2

Comments

Numbers that are not members of A000215.

Links

Table of n, a(n) for n=1..70.

Mathematica

Complement[Range[10000], {3, 5, 17, 257}] (* Harvey P. Dale, Aug 04 2023 *)

Crossrefs

Cf. A000215, A001690, A018252.

Sequence in context: A240817 A174416 A228728 * A039240 A039183 A039136

Adjacent sequences: A138885 A138886 A138887 * A138889 A138890 A138891

Keyword

easy,nonn

Author

Omar E. Pol, Apr 03 2008

Status

approved