Number of nonnegative integers k with n digits such that x^2 - s*x + p has only integer roots, where s and p denote the sum and product of the digits of k respectively.

A355574

Number of nonnegative integers k with n digits such that x^2 - s*x + p has only integer roots, where s and p denote the sum and product of the digits of k respectively.

Terms

    a(0) =2a(1) =90a(2) =223a(3) =2686a(4) =31601a(5) =370894a(6) =4220160a(7) =46962379a(8) =512600193

External references