Numbers n such that phi(n)^2 + sigma(n)^2 is an integer square.

Terms

a(0) =7a(1) =32a(2) =33a(3) =41a(4) =68a(5) =145a(6) =209a(7) =237a(8) =239a(9) =266a(10) =328a(11) =372a(12) =384a(13) =385a(14) =442a(15) =522a(16) =622a(17) =905a(18) =945a(19) =1157a(20) =1243a(21) =1288a(22) =1357a(23) =1581a(24) =1615a(25) =1643a(26) =1798a(27) =1853a(28) =1885a(29) =1978