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A128779 a(n) = denominator of Product_{k=1..n} (1 + {n/k}), where {x} is the fractional part of x, {x} = x - floor(x). 1

%I

%S 1,1,2,3,8,5,60,63,896,189,5760,275,142560,6435,256256,4729725,

%T 40255488,270725,916531200,34613649,1323008000,618100875,412580044800,

%U 1101163525,13664651083776,236102414625,51192627200000,21986435059875

%N a(n) = denominator of Product_{k=1..n} (1 + {n/k}), where {x} is the fractional part of x, {x} = x - floor(x).

%p a:=n->denom(product(1+frac(n/k),k=1..n)): seq(a(n),n=1..32); # _Emeric Deutsch_, Mar 30 2007

%Y Cf. A128778.

%K frac,nonn

%O 1,3

%A _Leroy Quet_, Mar 27 2007

%E More terms from _Emeric Deutsch_, Mar 30 2007

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Last modified September 21 01:46 EDT 2021. Contains 347596 sequences. (Running on oeis4.)