4147

This number is a composite.

+ The smaller of only two 2-sphenic numbers concatenated from two double-digit primes, (41, 47), i.e., 4147 = 11 * 13 * 29. The other is 7337 = 11 * 23 * 29. [Loungrides]

(There is one curio for this number that has not yet been approved by an editor.)

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