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!)
A025545 a(n) = (1/4 + 1/6 + ... + 1/c(n))*LCM{4, 6, ..., c(n)}, where c(n) = n-th composite number. 0

%I

%S 1,5,13,47,271,301,2287,2455,5225,5505,5757,5997,68487,70797,365073,

%T 4884549,15054047,15440147,15800507,32276689,32931889,570652913,

%U 581154833,591365033,11419719227,11598790427,11773384847,11939665247,12098387447,12253582487

%N a(n) = (1/4 + 1/6 + ... + 1/c(n))*LCM{4, 6, ..., c(n)}, where c(n) = n-th composite number.

%K nonn

%O 1,2

%A _Clark Kimberling_

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 October 26 08:00 EDT 2021. Contains 348267 sequences. (Running on oeis4.)