Numbers n such that n and tau(n) = A000005(n) have the same prime factors (ignoring multiplicity).

Terms

a(0) =1a(1) =2a(2) =8a(3) =9a(4) =12a(5) =18a(6) =72a(7) =80a(8) =96a(9) =108a(10) =128a(11) =288a(12) =448a(13) =486a(14) =625a(15) =720a(16) =768a(17) =864a(18) =972a(19) =1152a(20) =1200a(21) =1250a(22) =1620a(23) =1944a(24) =2000a(25) =2025a(26) =2560a(27) =4032a(28) =4050a(29) =5000