a(n) = denominator of Product_{k=1..n} (1 + {n/k}), where {x} is the fractional part of x, {x} = x - floor(x).
A128779
a(n) = denominator of Product_{k=1..n} (1 + {n/k}), where {x} is the fractional part of x, {x} = x - floor(x).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =5a(6) =60a(7) =63a(8) =896a(9) =189a(10) =5760a(11) =275a(12) =142560a(13) =6435a(14) =256256a(15) =4729725a(16) =40255488a(17) =270725a(18) =916531200a(19) =34613649a(20) =1323008000a(21) =618100875a(22) =412580044800a(23) =1101163525a(25) =236102414625
External references
- oeis: A128779