a(n) = the smallest positive integer with exactly n positive "isolated divisors". A divisor, k, of n is isolated if neither (k-1) nor (k+1) divides n.
A133997
a(n) = the smallest positive integer with exactly n positive "isolated divisors". A divisor, k, of n is isolated if neither (k-1) nor (k+1) divides n.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =15a(4) =36a(5) =45a(6) =126a(7) =96a(8) =144a(9) =120a(10) =324a(11) =240a(12) =336a(13) =432a(14) =360a(15) =480a(16) =672a(17) =864a(18) =720a(19) =840a(20) =1260a(21) =1008a(22) =1080a(23) =1920a(24) =1440a(25) =2040a(26) =1680a(27) =2016a(28) =2160a(29) =3024
External references
- oeis: A133997