99999199999
This number is a prime.
9 9999199999
Single Curio View: (Seek other curios for this number)
Prime numbers of the form Nd
(n, m) = 10^(2*n + m) -
d *10^n - 1, e.g., 99999199999,
are of interest to the recreational mathematics community.
Submitted: 2026-01-18 21:13:15; Last Modified: 2026-01-18 21:37:06.
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