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A092105 Primes p such that both p-2 and p-4 are semiprimes. 1
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Intersection of A063638 and A092104.
LINKS
EXAMPLE
97 is a member because 95=5*19 and 93=3*31
PROG
(PARI) isok(n) = (n>5) && isprime(n) && (bigomega(n-2) == 2) && (bigomega(n-4) == 2); \\ Michel Marcus, Oct 05 2013
CROSSREFS
Sequence in context: A323476 A345169 A350250 * A101938 A060330 A302720
KEYWORD
easy,nonn
AUTHOR
Zak Seidov, Feb 20 2004
EXTENSIONS
More terms from Ray Chandler, Feb 21 2004
STATUS
approved

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Last modified March 29 06:57 EDT 2024. Contains 371265 sequences. (Running on oeis4.)