A232010 Numbers k such that p^2 + k is composite for all prime p.

5, 11, 17, 21, 23, 26, 29, 31, 35, 41, 45, 47, 51, 53, 56, 59, 61, 65, 68, 71, 73, 77, 81, 83, 86, 87, 89, 91, 95, 101, 107, 110, 111, 113, 115, 116, 117, 119, 121, 125, 129, 131, 134, 137, 139, 141, 143, 146, 149, 151, 152, 155, 157, 161, 165, 167, 171, 173, 176

Offset

1,1

Comments

Primes from this sequence are in A067775.

Complement of A232012.

Links

Table of n, a(n) for n=1..59.

Formula

A232009(a(n)) = 0.

Example

7 is not in the sequence because 2^2 + 7 = 11 (prime).

Crossrefs

Cf. A232009, A067775, A232012, A023200.

Sequence in context: A344160 A314183 A314184 * A181573 A314185 A314186

Adjacent sequences: A232007 A232008 A232009 * A232011 A232012 A232013

Keyword

nonn

Author

Jaroslav Krizek, Nov 20 2013

Status

approved