31399...39731 (100-digits)

This number is a prime.

                                            3139971973 7866347113 9144865157
7269485891 7594191229 3874459187 7656925789 7479749143 1942288961 1373939731

+ Write this reversible prime in a 10-by-10 square. All rows, columns, and main diagonals are distinct reversible primes. This means the reverse 100-digit prime could have been submitted instead!

3139971973
7866347113
9144865157
7269485891
7594191229
3874459187
7656925789
7479749143
1942288961
1373939731
[Andersen]

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