30000000

This number is a composite.

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30000000+3000000+300000+30000+3000+300+30 plus one is prime. Eliminate one summand each time (left-to-right) and primes will be obtained all along. [Silva]

Submitted: 2010-04-11 19:08:25; Last Modified: 2010-04-12 00:08:28.