|
%I #8 Oct 05 2013 05:00:15
%S 37,53,59,89,97,163,223,239,251,269,293,307,331,397,419,449,521,547,
%T 593,673,683,691,701,757,853,953,997,1061,1103,1123,1151,1171,1193,
%U 1259,1319,1373,1511,1531,1567,1693,1783,1801,1823,1931,1987,2053,2161,2203
%N Primes p such that both p-2 and p-4 are semiprimes.
%C Intersection of A063638 and A092104.
%e 97 is a member because 95=5*19 and 93=3*31
%o (PARI) isok(n) = (n>5) && isprime(n) && (bigomega(n-2) == 2) && (bigomega(n-4) == 2); \\ _Michel Marcus_, Oct 05 2013
%Y Cf. A063638, A092104.
%K easy,nonn
%O 1,1
%A _Zak Seidov_, Feb 20 2004
%E More terms from _Ray Chandler_, Feb 21 2004
|
