A081466 - cp's OEIS frontend

A081466 Consider the mapping f(a/b) = (a^2+b^2)/(a^2-b^2) from rationals to rationals. Starting with 2/1 (a=2, b=1) and applying the mapping to each new (reduced) rational number gives 2/1, 5/3, 17/8, 353/225, ... Sequence gives values of the denominators.

n	a(n)
1	1
2	3
3	8
4	225
5	36992
6	6308330625
7	21009822254496776192
8	3255818067933293622186199316985612890625
9	3264008661830516310447364816658205121507617681188862393654856638929469798612992

[1, 3, 8, 225, 36992, 6308330625, 21009822254496776192, 3255818067933293622186199316985612890625, 3264008661830516310447364816658205121507617681188862393654856638929469798612992]

cp's OEIS Frontend

A081466 Consider the mapping f(a/b) = (a^2+b^2)/(a^2-b^2) from rationals to rationals. Starting with 2/1 (a=2, b=1) and applying the mapping to each new (reduced) rational number gives 2/1, 5/3, 17/8, 353/225, ... Sequence gives values of the denominators.

Table of values

List of values