Numbers whose number of divisors is a square.

Terms

a(0) =1a(1) =6a(2) =8a(3) =10a(4) =14a(5) =15a(6) =21a(7) =22a(8) =26a(9) =27a(10) =33a(11) =34a(12) =35a(13) =36a(14) =38a(15) =39a(16) =46a(17) =51a(18) =55a(19) =57a(20) =58a(21) =62a(22) =65a(23) =69a(24) =74a(25) =77a(26) =82a(27) =85a(28) =86a(29) =87