Squares k such that gcd(sigma(k),usigma(k)) > 1, where usigma is A034448.

Terms

a(0) =225a(1) =576a(2) =900a(3) =3600a(4) =8649a(5) =11025a(6) =14400a(7) =19881a(8) =20449a(9) =21025a(10) =27225a(11) =28224a(12) =34596a(13) =38025a(14) =44100a(15) =47961a(16) =53824a(17) =57600a(18) =58564a(19) =62001a(20) =65025a(21) =69696a(22) =79524a(23) =81225a(24) =81796a(25) =84100a(26) =93025a(27) =97344a(28) =106929a(29) =108900