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.

A379816

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.

Terms

    a(0) =0a(1) =4a(2) =12a(3) =0a(4) =25a(5) =18a(6) =448a(7) =16a(8) =12a(9) =100a(10) =1100a(11) =18a(12) =4225a(13) =112a(14) =240a(15) =18a(16) =289a(17) =36a(18) =549100a(19) =25a(20) =588a(21) =2178a(22) =13248a(23) =72a(24) =45a(25) =676a(26) =108a(27) =126a(28) =142129a(29) =180

External references