/usr/lib/R/site-library/contfrac/INDEX is in r-cran-contfrac 1.1-9-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | CF Continued fraction convergent
as_cf Converts a real number to continued fraction
form
contfrac-package Continued fractions
convergents Partial convergents of continued fractions
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