OFFSET
1,1
COMMENTS
Original definition: Primes of the form ((x+y)/3+2)/(x-y), where x=prime and y=composite. The current sequence is largely incorrect because many values are missing; for example x=17 with y=16 contributes 13, x=23 with y=22 contributes 17, x=53 with y=52 contributes 37 etc. - R. J. Mathar, Apr 25 2010
All primes up to 100,000 are members. 835 is not a member. - Charles R Greathouse IV, Nov 25 2014
PROG
(PARI) is(n)=forprime(x=5, , my(y=(3*n*x-x-6)/(3*n+1)); if(denominator(y)==1 && !isprime(y), return(isprime(n)))) \\ may loop forever if not a member; Charles R Greathouse IV, Nov 25 2014
CROSSREFS
KEYWORD
dead
AUTHOR
Juri-Stepan Gerasimov, Aug 28 2008
STATUS
approved