217

This number is a composite.

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47 and 89 are primes, as is their concatenation (4789). Inserting the lowly 0 between them transforms the prime into a power, i.e. 47089, the square of 217. [Trotter]

Submitted: 2001-07-23 01:36:39; Last Modified: 2008-01-30 17:28:00.