2357

This number is a prime.

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Inserting nineteen zeros between the four prime digits of 2357 makes another prime of prime length sixtyone. Note that 23 + 57 = 19 + 61 and also 19 + 4 = 23 as 57 + 4 = 61. [De Geest]

Submitted: 2001-12-26 03:22:59; Last Modified: 2008-01-30 17:28:00.