a(n) = the smallest positive integer with exactly n positive "non-isolated divisors". A divisor, k, of n is non-isolated if (k-1) or (k+1) also divides n.
A133996
a(n) = the smallest positive integer with exactly n positive "non-isolated divisors". A divisor, k, of n is non-isolated if (k-1) or (k+1) also divides n.
Terms
- a(0) =2a(1) =6a(2) =12a(3) =30a(4) =60a(5) =90a(6) =180a(7) =360a(8) =630a(9) =420a(10) =840a(11) =1680a(12) =4200a(13) =1260a(14) =2520a(15) =3780a(16) =7560a(17) =15120a(18) =13860a(19) =36960a(20) =49140a(21) =27720a(22) =32760a(23) =65520a(24) =83160a(25) =98280a(26) =196560a(27) =314160a(28) =277200a(29) =491400
External references
- oeis: A133996