31316...91489 (48-digits)

This number is a prime.

31316913 8727147145 2100449741 4685822072 9781791489

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This number constitutes the home prime of 80, the largest known home prime for any two-digit composite integer and is achieved in 31 steps using the repeated factoring and concatenation procedure. [Schiffman]

Submitted: 2010-06-25 20:48:51; Last Modified: 2010-10-21 16:30:42.