a(n) = product of divisors d of n such that d^k is not equal to n for any k >= 1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =6a(6) =1a(7) =4a(8) =1a(9) =10a(10) =1a(11) =144a(12) =1a(13) =14a(14) =15a(15) =8a(16) =1a(17) =324a(18) =1a(19) =400a(20) =21a(21) =22a(22) =1a(23) =13824a(24) =1a(25) =26a(26) =9a(27) =784a(28) =1a(29) =27000