/usr/lib/mysql-testsuite/std_data/numbers.txt is in mysql-testsuite-5.6 5.6.16-1~exp1.
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
2 3 5 7 11 13 17 23 29