12233...88889 (36-digits)

This number is a prime.

122333 4444555556 6666677777 7788888889

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An easy-to-remember prime; Write one 1, two 2's, three 3's, ... , eight 8's, then replace the last digit with a 9. [Oudra]

Submitted: 2018-03-08 00:11:54; Last Modified: 2018-03-08 02:30:07.