login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A096294 Triangle T(n,k) read by rows: for n >=0 and n >= k >=0, the fraction of positive integers with exactly k of the first n primes as divisors is T(n,k)/A002110(n). 2

%I

%S 1,1,1,2,3,1,8,14,7,1,48,92,56,13,1,480,968,652,186,23,1,5760,12096,

%T 8792,2884,462,35,1,92160,199296,152768,54936,10276,1022,51,1,1658880,

%U 3679488,2949120,1141616,239904,28672,1940,69,1,36495360,82607616

%N Triangle T(n,k) read by rows: for n >=0 and n >= k >=0, the fraction of positive integers with exactly k of the first n primes as divisors is T(n,k)/A002110(n).

%C Sum of entries in n-th row is A002110(n), the product of the first n primes (primorial numbers, first definition).

%e Triangle begins:

%e 1

%e 1 1

%e 2 3 1

%e 8 14 7 1

%e 48 92 56 13 1

%e 480 968 652 186 23 1

%Y First column is A005867; second column is A078456. See also A096180.

%K nonn,tabl

%O 0,4

%A _Matthew Vandermast_, Jun 24, 2004

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

Content is available under The OEIS End-User License Agreement .

Last modified November 27 01:09 EST 2014. Contains 250152 sequences.