a(n) is the least positive integer k such that k! has exactly n infinitary divisors that are factorials, or -1 if no such number exists.
A375638
a(n) is the least positive integer k such that k! has exactly n infinitary divisors that are factorials, or -1 if no such number exists.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =17a(6) =42a(7) =43a(8) =138a(9) =125a(10) =220a(11) =33a(12) =387a(13) =1766a(14) =3269a(15) =7014a(16) =1398a(17) =1399a(18) =1958a(19) =19143a(20) =30759
External references
- oeis: A375638