19973...37991 (25-digits)

This number is a prime.

                                                 19973 9240197879 1042937991

Just showing those entries submitted by 'Blanchette': (Click here to show all)

+ Arrange this palindromic prime into a 5-by-5 array and each row, column, and main diagonal will form a reversible prime. [Blanchette]

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