Numbers k such that the geometric mean of phi(k) and sigma(k) is an integer.

Terms

a(0) =1a(1) =14a(2) =30a(3) =51a(4) =105a(5) =170a(6) =194a(7) =248a(8) =264a(9) =364a(10) =405a(11) =418a(12) =477a(13) =595a(14) =679a(15) =714a(16) =760a(17) =780a(18) =1023a(19) =1455a(20) =1463a(21) =1485a(22) =1496a(23) =1512a(24) =1524a(25) =1674a(26) =1715a(27) =1731a(28) =1796a(29) =1804