12233...99899 (45-digits)

This number is a composite.

                           12233 3444455555 6666667777 7778888889 9998999899

The smallest semiprime composed of one 1, two 2's, ..., nine 9's. That is 122333444455555666666777777788888899998999899/3 = 40777814818518555555592592596296299999666633 is prime. [Poo Sung]