OFFSET

1,3

COMMENTS

The divisibility of k by 3 of all terms after a(1) is conjectural. Offsets not divisible by 3 are given as -k instead of k/3.

PROG

(PARI) kmax=0; for(n=2, 10^7, forstep(k=1, n, 2, if(isprime(2*n-k)&&isprime(2*n+k), if(k>kmax, if(k%3!=0, print1(-k, ", "), print1(k/3, ", ")); kmax=k); break(1))))

CROSSREFS

KEYWORD

sign,more

AUTHOR

Hugo Pfoertner, May 03 2019

STATUS

approved