A098806 Smallest prime p such that 2n-p and 2n+p are both prime.

5, 7, 11, 11, 13, 17, 17, 23, 23, 29, 31, 37, 37, 43, 41, 43, 47, 53, 53, 59, 67, 67, 71, 71, 79, 89, 83, 89, 101, 97, 101, 101, 109, 107, 131, 113, 127, 131, 127, 131, 137, 137, 179, 149, 157, 157, 193, 191, 167, 179, 179, 181, 193, 193, 191, 193, 197, 211, 227, 211

Offset

2,1

Links

Table of n, a(n) for n=2..61.

Prog

(PARI) f(n) = for(p=1, n, for(x=1, n, y=x-p; z=x+p; if(isprime(y)&isprime(z)&isprime(x), print1(x", "); break)))

Crossrefs

Cf. A098807.

Sequence in context: A206770 A107257 A275515 * A256103 A275645 A122278

Adjacent sequences: A098803 A098804 A098805 * A098807 A098808 A098809

Keyword

easy,nonn

Author

Cino Hilliard, Oct 06 2004

Status

approved