Numbers n such that phi(n) * sigma(n) + 16 is a perfect square.

Terms

a(0) =7a(1) =21a(2) =32a(3) =46a(4) =60a(5) =77a(6) =123a(7) =124a(8) =132a(9) =221a(10) =224a(11) =254a(12) =261a(13) =287a(14) =308a(15) =312a(16) =376a(17) =437a(18) =445a(19) =506a(20) =534a(21) =539a(22) =665a(23) =680a(24) =717a(25) =752a(26) =770a(27) =798a(28) =860a(29) =948