A089490 Third occurrence where (p-q)/(q-3), p and q are primes.

13, 19, 37, 37, 19, 13, 13, 13, 67, 19, 97, 31, 19, 97, 19, 37, 103, 61, 13, 43, 67, 19, 31, 61, 37, 19, 13, 79, 61, 13, 43, 31, 13, 31, 19, 43, 19, 37, 31, 13, 19, 37, 19, 13, 31, 13, 19, 19, 19, 19, 13, 13, 19, 13

Offset

5,1

Links

Table of n, a(n) for n=5..58.

Prog

(PARI) \ r is the occurrence desired 1=first, 2=second etc. \d is the amount we take from q diff2sqp2(n, r, d) = { forprime(q=d+1, n, c=0; forprime(p=q+1, n, y=(p-q)/(q-d); if(y==floor(y), if(isprime(y), c++; if(c==r, print1(y", "); break)) ) ) ) }

Crossrefs

Sequence in context: A154076 A275660 A088186 * A057749 A040070 A322923

Adjacent sequences: A089487 A089488 A089489 * A089491 A089492 A089493

Keyword

easy,nonn

Author

Cino Hilliard, Dec 28 2003

Status

approved