137

This number is a prime.

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The 13th term of the puzzle sequence that begins 2, 23, 235, 2357, 12357, 3, 37, 37, 3, 3, 3, 37, ... . Can you guess the rule for generating this sequence? [Honaker]

Submitted: 2018-03-25 01:28:08; Last Modified: 2021-01-19 00:19:12.