A138887 Numbers that are not Sophie Germain primes.

0, 1, 4, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68

Offset: 0

Author

Omar E. Pol, Apr 05 2008

Keywords

• easy
• nonn

Comments

Nonnegative integers that are not in A005384.

A156660(a(n)) = 0; A053176 is a subsequence. [From Reinhard Zumkeller, Feb 18 2009]

Crossrefs

Cf. A001690, A005384, A053176, A062289, A138888, A138889, A138890, A138891.