57975...97531 (55-digits)

This number is a prime.

                57975 3135797531 3579753135 7975313579 7531357975 3135797531

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

+ Largest prime less than a googol which contains alternating waves of odd digits starting at 5. Also noteworthy is its super-prime digit sum of 277. [Barnes]

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