2357

This number is a prime.

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The alternating product-series 235*7 +/- 23*57 -/+ 2*357 +/- 23*5*7 -/+ 2*35*7 +/- 2*3*57 -/+ 2*3*5*7 yield prime sums (2689, 601) whose concatenations (2689601, 6012689) are also prime. [Beedassy]

Submitted: 2009-06-25 21:12:38; Last Modified: 2009-06-26 00:13:29.