A014089 Sum of a square and a prime.

2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 31, 32, 33, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 59, 60, 61, 62

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Comments

A002471(a(n))>0; complement of A014090; A143989 is a subsequence. [From Reinhard Zumkeller, Sep 07 2008]

Crossrefs

Cf. A058654.

Programs

PARI

isok(n) = for (i = 0, sqrtint(n), if (isprime(n - i^2), return (1))); 0 \\ Michel Marcus, Sep 04 2013