Floor(sqrt(n))-perfect numbers.

Terms

a(0) =2a(1) =3a(2) =4a(3) =21a(4) =26a(5) =27a(6) =33a(7) =35a(8) =38a(9) =46a(10) =58a(11) =62a(12) =74a(13) =475a(14) =605a(15) =1083a(16) =1719a(17) =2007a(18) =2151a(19) =2169a(20) =2259a(21) =2313a(22) =2421a(23) =2431a(24) =2439a(25) =2493a(26) =2529a(27) =2547a(28) =2637a(29) =2737