/usr/share/texmf-texlive/metapost/base/troffnum.mp is in texlive-metapost 2009-15.
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 6 7 8 9 10 | % $Id: troffnum.mp,v 1.2 2004/09/19 21:47:11 karl Exp $
% Public domain.
% Default init_numbers for use with troff
% Don't input this directly--format.mp uses this file
init_numbers(btex$-$etex, btex$1$etex, btex$ times 10$etex,
btex$"" sup -$etex, btex$"" sup 2$etex);
Fe_base := btex $10$ etex;
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