Numbers n such that phi(n) * sigma(n) + 9 is a perfect square.

Terms

a(0) =10a(1) =12a(2) =27a(3) =38a(4) =90a(5) =95a(6) =110a(7) =114a(8) =142a(9) =152a(10) =230a(11) =344a(12) =356a(13) =395a(14) =442a(15) =474a(16) =639a(17) =684a(18) =738a(19) =973a(20) =1098a(21) =1349a(22) =1558a(23) =1562a(24) =1566a(25) =1956a(26) =2365a(27) =2392a(28) =2408a(29) =2438