Numbers that are the product of an even number of distinct primes.

Terms

a(0) =1a(1) =6a(2) =10a(3) =14a(4) =15a(5) =21a(6) =22a(7) =26a(8) =33a(9) =34a(10) =35a(11) =38a(12) =39a(13) =46a(14) =51a(15) =55a(16) =57a(17) =58a(18) =62a(19) =65a(20) =69a(21) =74a(22) =77a(23) =82a(24) =85a(25) =86a(26) =87a(27) =91a(28) =93a(29) =94