Product of the divisors of n whose arithmetic derivative is odd.

Terms

a(0) =1a(1) =2a(2) =3a(3) =2a(4) =5a(5) =36a(6) =7a(7) =2a(8) =3a(9) =100a(10) =11a(11) =36a(12) =13a(13) =196a(14) =15a(15) =2a(16) =17a(17) =648a(18) =19a(19) =100a(20) =21a(21) =484a(22) =23a(23) =36a(24) =5a(25) =676a(26) =81a(27) =196a(28) =29a(29) =54000