Numbers n such that phi(n) * sigma(n) + 4 is a perfect square.

Terms

a(0) =8a(1) =15a(2) =24a(3) =28a(4) =35a(5) =40a(6) =42a(7) =87a(8) =92a(9) =126a(10) =130a(11) =143a(12) =145a(13) =150a(14) =174a(15) =184a(16) =273a(17) =323a(18) =369a(19) =374a(20) =378a(21) =396a(22) =847a(23) =899a(24) =957a(25) =984a(26) =1134a(27) =1136a(28) =1220a(29) =1236