Numbers n such that sigma(n)^2 - phi(n)^2 is a perfect square.

Terms

a(0) =1a(1) =95a(2) =99a(3) =146a(4) =323a(5) =377a(6) =1095a(7) =1102a(8) =1351a(9) =1368a(10) =1630a(11) =1919a(12) =1943a(13) =2261a(14) =2639a(15) =2743a(16) =3915a(17) =4607a(18) =4743a(19) =5042a(20) =5045a(21) =5183a(22) =5249a(23) =6347a(24) =6497a(25) =7389a(26) =8265a(27) =8307a(28) =8749a(29) =9407