Integers n such that sigma(n)/phi(n) is a perfect square.

Terms

a(0) =1a(1) =14a(2) =30a(3) =105a(4) =248a(5) =264a(6) =418a(7) =714a(8) =1485a(9) =3080a(10) =3135a(11) =3596a(12) =3828a(13) =3956a(14) =4064a(15) =5396a(16) =6678a(17) =8636a(18) =10098a(19) =12648a(20) =20026a(21) =20790a(22) =21318a(23) =22152a(24) =23374a(25) =24882a(26) =25714a(27) =26040a(28) =35074a(29) =35343