The book is now available! 649
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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]


  Submitted: 2015-02-24 07:45:55;   Last Modified: 2015-02-24 08:35:18.

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