Let u(1) = u(2) = u(3) = u(4) = 1, u(n+4)*(n+4) = u(n+3)*(n+3)+u(n+2)*(n+2)+u(n+1)*(n+1)+u(n)*n; sequence gives values of n such that u(n) is an integer.

A075832

Let u(1) = u(2) = u(3) = u(4) = 1, u(n+4)*(n+4) = u(n+3)*(n+3)+u(n+2)*(n+2)+u(n+1)*(n+1)+u(n)*n; sequence gives values of n such that u(n) is an integer.

Terms

    a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =67a(6) =150a(7) =154a(8) =387a(9) =547a(10) =813a(11) =1034a(12) =1710a(13) =4994a(14) =13582a(15) =700427a(16) =1598953a(17) =2960411

External references