This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A119932 Triangle of denominators of the cube of a certain lower triangular matrix. 5
 1, 8, 8, 108, 108, 27, 576, 576, 576, 64, 18000, 18000, 18000, 2000, 125, 21600, 21600, 21600, 21600, 5400, 216, 1234800, 1234800, 1234800, 1234800, 308700, 12348, 343, 5644800, 5644800, 5644800, 5644800 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The triangle of the corresponding numerators is A119935. See a comment under A119935 on the relation to the triangle A027447. LINKS W. Lang: First ten rows and rationals. FORMULA a(i,j)= denominator(r(i,j)) with r(i,j):=(A^3)[i,j], where the lower triangular matrix A has elements a[i,j] = 1/i if j<=i, 0 if j>i. CROSSREFS a(i, j)=1/A002024(i, j), i>=1, j<=i. Row sums give A119933. Row sums of the triangle of rationals are identical 1. Sequence in context: A286068 A228071 A192386 * A270118 A270150 A065241 Adjacent sequences:  A119929 A119930 A119931 * A119933 A119934 A119935 KEYWORD nonn,easy,tabl,frac AUTHOR Wolfdieter Lang, Jul 20 2006 STATUS approved

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.

Last modified March 21 20:16 EDT 2019. Contains 321382 sequences. (Running on oeis4.)