A092105 Primes p such that both p-2 and p-4 are semiprimes.

37, 53, 59, 89, 97, 163, 223, 239, 251, 269, 293, 307, 331, 397, 419, 449, 521, 547, 593, 673, 683, 691, 701, 757, 853, 953, 997, 1061, 1103, 1123, 1151, 1171, 1193, 1259, 1319, 1373, 1511, 1531, 1567, 1693, 1783, 1801, 1823, 1931, 1987, 2053, 2161, 2203

Offset: 1

Author

Zak Seidov, Feb 20 2004

Keywords

• easy
• nonn

Comments

Intersection of A063638 and A092104.

Examples

			97 is a member because 95=5*19 and 93=3*31
		

Crossrefs

Cf. A063638, A092104.

Programs

PARI

isok(n) = (n>5) && isprime(n) && (bigomega(n-2) ==  2) && (bigomega(n-4) == 2); \\ Michel Marcus, Oct 05 2013

Extensions

More terms from Ray Chandler, Feb 21 2004