

A089502


Fifth occurrence where (pq)/(q5), p and q are primes.


0



17, 13, 17, 13, 17, 41, 31, 53, 53, 17, 71, 13, 13, 23, 41, 107, 17, 41, 71, 17, 13, 23, 23, 53, 13, 83, 47, 17, 31, 23, 47, 47, 11, 31, 31, 41, 41, 41, 23, 41, 13, 31, 23, 23, 23, 17, 13, 13, 13
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

7,1


LINKS

Table of n, a(n) for n=7..55.


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=(pq)/(qd); if(y==floor(y), if(isprime(y), c++; if(c==r, print1(y", "); break)) ) ) ) }


CROSSREFS

Sequence in context: A217893 A063518 A168250 * A279058 A195534 A128158
Adjacent sequences: A089499 A089500 A089501 * A089503 A089504 A089505


KEYWORD

easy,nonn


AUTHOR

Cino Hilliard, Dec 28 2003


STATUS

approved



