57975...97531 (55-digits)

This number is a prime.

57975 3135797531 3579753135 7975313579 7531357975 3135797531

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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]

Submitted: 2020-07-21 21:46:30; Last Modified: 2020-07-21 23:24:01.