A161961 Denominator of ratio in lowest terms of pi(n^2)/(n*pi(n)), where pi(x) = A000720(x).
1, 3, 4, 5, 18, 28, 16, 18, 8, 11, 30, 2, 21, 15, 16, 119, 21, 19, 80, 168, 44, 23, 72, 75, 117, 81, 252, 145, 150, 341, 88, 363, 374, 77, 66, 148, 2, 39, 480, 533, 273, 602, 616, 35, 644, 15, 40, 35, 750, 85, 260, 848, 864, 440, 896, 912, 464, 1003, 1020, 366, 279, 126, 96, 585
Offset: 2
Examples
The first few fractions S(n) are 1, 2/3, 3/4, 3/5, 11/18, 15/28, 9/16, 11/18, 5/8, ...
Programs
Extensions
Keyword:frac added by R. J. Mathar, Jun 30 2009
Definition corrected and sequence extended by R. J. Mathar, Oct 05 2009
Comments