A081475 - cp's OEIS frontend

A081475 Consider the mapping f(x/y) = (x+y)/(2xy) where x/y is a reduced fraction. Beginning with x_0 = 1 and y_0 = 2, repeated application of this mapping produces a sequence of fractions x_n/y_n; a(n) is the n-th numerator.

n	a(n)
0	1
1	3
2	7
3	31
4	367
5	21199
6	15311887
7	648309901711
8	19853227652502777487
9	25742087295488761786102488482959
10	1022127038655087543344600484892552190865956757100687

[1, 3, 7, 31, 367, 21199, 15311887, 648309901711, 19853227652502777487, 25742087295488761786102488482959, 1022127038655087543344600484892552190865956757100687]

cp's OEIS Frontend

A081475 Consider the mapping f(x/y) = (x+y)/(2xy) where x/y is a reduced fraction. Beginning with x_0 = 1 and y_0 = 2, repeated application of this mapping produces a sequence of fractions x_n/y_n; a(n) is the n-th numerator.

Table of values

List of values