Sqrt(sigma(A008847(n)^2)), where A008847 lists m such that sigma(m^2) is a square.

Terms

a(0) =1a(1) =11a(2) =31a(3) =341a(4) =1729a(5) =2821a(6) =19019a(7) =31031a(8) =43617a(9) =43491a(10) =68961a(11) =72219a(12) =82677a(13) =86583a(14) =117831a(15) =117831a(16) =187131a(17) =347529a(18) =347529a(19) =479787a(20) =503347a(21) =414309a(22) =436107a(23) =496713a(24) =478401a(25) =503347a(26) =758571a(27) =794409a(28) =909447a(29) =952413