9999959999

This number is a prime.

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   9 9 9 9
    9 5 9
     9 9
      9
The only triangle-congruent prime containing one odd prime digit in the center. [Capelle]

Submitted: 2008-01-22 21:01:18;   Last Modified: 2008-01-30 11:28:00.
Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell