OFFSET
1,1
COMMENTS
These numbers times 5 are semiprimes.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
EXAMPLE
31*37 = 1147, 1147-2 = 1145, 1145/5 = 229 is a term.
MATHEMATICA
Select[(Times @@@ Partition[Prime[Range[1000]], 2, 1] - 2) / 5, PrimeQ] (* Amiram Eldar, May 26 2024 *)
PROG
(PARI) g(n, p=5) = { for(x=1, n, y=prime(x)*prime(x+1)-2; if(y%p==0, if(isprime(y/p), print1(y/p, ", ")))) }
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Cino Hilliard, Dec 27 2006
STATUS
approved