568458

Appears in sequences

• a(n) = 676*n^2 - 2*n.at n=28A158392
• Minimal covering numbers.at n=77A160559
• a(n) is the smallest integer k > n such that sqrt(1/n + 1/k) is a rational number; or 0 if no such k exists.at n=57A379815
• a(n) is the smallest nonnegative integer k such that n + k and n*k are squares, or -1 if there is no such number.at n=57A383898