Numbers k such that sigma(k^2-k-1) = k*(k+1).

Terms

a(0) =8a(1) =15a(2) =24a(3) =35a(4) =80a(5) =99a(6) =120a(7) =255a(8) =399a(9) =440a(10) =960a(11) =1520a(12) =2024a(13) =2115a(14) =2915a(15) =3024a(16) =3135a(17) =3599a(18) =4224a(19) =4355a(20) =7395a(21) =8835a(22) =10200a(23) =13224a(24) =15875a(25) =17160a(26) =19880a(27) =21024a(28) =22200a(29) =23715