A115396 Smallest prime p such that p-/+2n are semiprimes.

23, 29, 71, 17, 59, 37, 71, 41, 67, 71, 43, 109, 59, 67, 173, 83, 89, 151, 103, 89, 127, 101, 131, 113, 127, 109, 131, 113, 127, 193, 157, 157, 181, 179, 229, 163, 193, 191, 211, 223, 223, 239, 241, 211, 211, 211, 271, 281, 241, 241, 263, 307, 307, 373, 293

Offset

1,1

Comments

Cf. A063643 Primes p such that p+/-2 are semiprimes, A117328 Primes p such that p+/-4 are semiprimes.

Links

Table of n, a(n) for n=1..55.

Example

a(100)=571 because 571-2*100=371=7*53 (semiprime), 571+2*100=771=3*257 (semiprime).

Crossrefs

Cf. A063643.

Sequence in context: A092518 A355983 A110584 * A180538 A227217 A229176

Adjacent sequences: A115393 A115394 A115395 * A115397 A115398 A115399

Keyword

nonn

Author

Zak Seidov, Mar 08 2006

Status

approved