login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A128778 a(n) = numerator of Product_{k=1..n} (1 + {n/k}), where {x} is the fractional part of x, {x} = x - floor(x). 1

%I

%S 1,1,3,4,25,9,343,256,6561,1250,161051,1728,4826809,235298,11390625,

%T 134217728,6975757441,14348907,322687697779,4000000000,264760015527,

%U 207499396808,952809757913927,220150628352,11920928955078125

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

%p a:=n->numer(product(1+frac(n/k),k=1..n)): seq(a(n),n=1..30); # _Emeric Deutsch_, Mar 31 2007

%Y Cf. A128779.

%K frac,nonn

%O 1,3

%A _Leroy Quet_, Mar 27 2007

%E More terms from _Emeric Deutsch_, Mar 31 2007

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 22 05:03 EDT 2021. Contains 347605 sequences. (Running on oeis4.)