A046216 First denominator and then numerator of 1/2-Pascal triangle (by row), excluding 1's.

2, 2, 3, 2, 3, 2, 5, 3, 2, 5, 2, 7, 2, 11, 2, 11, 2, 7, 2, 9, 9, 11, 9, 2, 9, 2, 11, 2, 27, 20, 20, 2, 27, 2, 11, 2, 13, 19, 2, 67, 40, 2, 67, 19, 2, 13, 2, 15, 2, 51, 2, 105, 2, 147, 2, 147, 2, 105, 2, 51, 2, 15, 2, 17, 33, 78, 126, 147, 126, 78, 33, 2, 17, 2

Offset

1,1

Links

Table of n, a(n) for n=1..74.

Example

1/1; -->
1/1 1/1; -->
1/1 1/2 1/1; --> 2
1/1 3/2 3/2 1/1; --> 2 3 2 3
1/1 5/2 3/1 5/2 1/1;  --> ...
1/1 7/2 11/2 11/2 7/2 1/1;
1/1 9/2 9/1 11/1 9/1 9/2 1/1;
1/1 11/2 27/2 20/1 20/1 27/2 11/2 1/1; ...

Crossrefs

Cf. A046213.

Sequence in context: A235922 A255598 A060324 * A105560 A331597 A356231

Adjacent sequences: A046213 A046214 A046215 * A046217 A046218 A046219

Keyword

tabf,nonn,frac,less

Author

Mohammad K. Azarian

Extensions

More terms from Sean A. Irvine, Apr 07 2021

Status

approved