649

This number is a composite.

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+ The smallest 3-digit brilliant number formed from the concatenation of composite digits. Note that its prime factors, (11, 59), create another brilliant number, 1159=19*61, whose prime factors create a third brilliant number, i.e., 649=11*59, 1159=19*61, 1961=37*53. So, 649 is an "extra-brilliant number." [Loungrides]

(There are 2 curios for this number that have not yet been approved by an editor.)

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