Geometric mean of phi(n) and sigma(n) is an integer, n odd.

Terms

a(0) =1a(1) =51a(2) =105a(3) =405a(4) =477a(5) =595a(6) =679a(7) =1023a(8) =1455a(9) =1463a(10) =1485a(11) =1715a(12) =1731a(13) =2651a(14) =2945a(15) =3135a(16) =3567a(17) =4381a(18) =5797a(19) =5859a(20) =8245a(21) =8255a(22) =8721a(23) =9639a(24) =9809a(25) =10127a(26) =10153a(27) =10179a(28) =10295a(29) =11935