OFFSET
1,2
LINKS
Zhining Yang, Table of n, a(n) for n = 1..300
Zhining Yang, Blog
EXAMPLE
a(5) = 11 since 5 = (27^2 + 11)/(27 + 11^2) and there is no integer k < 11 such that 5 = (j^2 + k)/(j + k^2) with j > k > 1.
PROG
(PARI) for(n=1, 100, for(b=1, 10^8, t=b*(b*n-1); a=floor((n+sqrt(n*n+4*t))/2); if(a*(a-n)==t, print1(b, ", "); break)))
CROSSREFS
KEYWORD
nonn
AUTHOR
Zhining Yang, Jul 27 2017
STATUS
approved