A089553 Seventh occurrence where (p-q)/(q-7), p and q are primes.

47, 43, 53, 37, 113, 101, 29, 29, 173, 61, 89, 173, 43, 43, 137, 71, 59, 59, 29, 47, 71, 29, 53, 47, 59, 43, 53, 23

Offset

7,1

Links

Table of n, a(n) for n=7..34.

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: A033367 A052352 A265673 * A165868 A291513 A345502

Adjacent sequences: A089550 A089551 A089552 * A089554 A089555 A089556

Keyword

easy,nonn

Author

Cino Hilliard, Dec 28 2003

Status

approved