OFFSET
2,1
COMMENTS
If q>10^22 then q is a probable prime. - Pierre CAMI, Jan 07 2014
LINKS
Pierre CAMI, Table of n, a(n) for n = 2..1376
EXAMPLE
For primorial=30, (p,q)=(7,53) as 7+53=2*30.
PROG
(PARI) ospp(N)= { i=4; while(1, Q=2*N-prime(i); if( ispseudoprime(2*N-prime(i)), print(N, ", ", prime(i) ); return(1) ); i++ ); \end WHILE }
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Bill McEachen, Nov 15 2008
EXTENSIONS
Improved description from T. D. Noe
STATUS
approved