Product of numbers <= n that have a prime factor in common with n.

Terms

a(0) =1a(1) =2a(2) =3a(3) =8a(4) =5a(5) =144a(6) =7a(7) =384a(8) =162a(9) =19200a(10) =11a(11) =1244160a(12) =13a(13) =4515840a(14) =1458000a(15) =10321920a(16) =17a(17) =75246796800a(18) =19a(19) =278691840000a(20) =1080203040a(21) =899245670400a(22) =23a(24) =375000a(26) =7142567040a(28) =29