a(n) is the smallest number k >= 1 with exactly n divisors d, for which sigma(k) is divisible by d*sigma(d).

A344103

a(n) is the smallest number k >= 1 with exactly n divisors d, for which sigma(k) is divisible by d*sigma(d).

Terms

    a(0) =1a(1) =10a(2) =6a(3) =30a(4) =132a(5) =546a(6) =270a(7) =120a(8) =840a(9) =672a(10) =1560a(11) =3960a(12) =4320a(13) =6048a(14) =9120a(15) =16380a(16) =26208a(17) =12180a(18) =36540a(19) =37380a(20) =10920a(21) =55692a(22) =34440a(23) =68040a(24) =112140a(25) =51480a(26) =63840a(27) =103320a(28) =30240a(29) =219960

External references