24

This number is a composite.

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The largest known natural number n such that: prime(n+1) - prime(n) = φ(n). Note that prime(φ(24)+1) - prime(φ(24)) = φ(φ(24)). [Capelle]

Submitted: 2009-09-06 12:18:12; Last Modified: 2014-07-22 23:54:53.