OFFSET
1,1
COMMENTS
EXAMPLE
16*k/(16+k) is an integer for k = 16, 48, 112, and 240. These k-values give the integers 8, 12, 14, and 15, respectively. Since none are prime, 16 is a member of this sequence.
PROG
(PARI) a(n)=for(k=1, n*(n-1), s=(k*n)/(k+n); if(floor(s)==s, if(ispseudoprime(s), return(k))))
n=1; while(n<300, if(a(2*n)==0, print1(2*n, ", ")); n+=1)
CROSSREFS
KEYWORD
nonn
AUTHOR
Derek Orr, May 27 2014
STATUS
approved