A140216 -id:A140216 - cp's OEIS frontend

A140218 Denominators of the inverse triangle to that described in A133135.

1, 1, 1, 1, 2, 1, 1, 2, 1, 1, 1, 4, 1, 2, 1, 1, 4, 1, 2, 1, 1, 1, 4, 1, 1, 1, 2, 1, 1, 4, 1, 1, 1, 2, 1, 1, 1, 8, 1, 2, 1, 4, 1, 2, 1, 1, 8, 1, 2, 1, 4, 1, 2, 1, 1, 1, 8, 1, 1, 1, 4, 1, 2, 1, 2, 1, 1, 8, 1, 1, 1, 4, 1, 2, 1, 2, 1, 1, 1, 8, 1, 2, 1, 2, 1, 2, 1, 4, 1, 2, 1, 1, 8, 1, 2, 1, 2, 1, 2, 1, 4, 1, 2, 1, 1

Offset: 0

Paul Curtz, Jun 22 2008

The inverse of the triangle of fractions starts
1;
-1, 1;
1, -3/2, 1;
-1, 3/2,-2, 1;
1, -5/4, 2, -5/2, 1;
-1, 5/4 -1, 5/2, -3, 1;
1, -7/4, 1, 0, 3, -7/2, 1;
-1, 7/4,-4, 0, 2, 7/2,-4, 1;
1, 3/8, 4,-21/2, -2, 21/4, 4,-9/2, 1;
-1, -3/8,13, 21/2,-26,-21/4,10, 9/2,-5, 1;
to yield the triangle of denominators
1;
1,1;
1,2,1;
1,2,1,1;
1,4,1,2,1;
1,4,1,2,1,1;
1,4,1,1,1,2,1;
1,4,1,1,1,2,1,1;
1,8,1,2,1,4,1,2,1;
1,8,1,2,1,4,1,2,1,1;
1,8,1,1,1,4,1,2,1,2,1;
1,8,1,1,1,4,1,2,1,2,1,1;
Number pairs show up if reading this along diagonals or columns.

Cf. A133135, A140216, A000079.

Extended by R. J. Mathar, Aug 02 2008

cp's OEIS Frontend

A140218 Denominators of the inverse triangle to that described in A133135.

Views

Author

Keywords

Comments

Crossrefs

Extensions