15831...57701 (474-digits)
This number is a prime.
Just showing those entries submitted by 'Earls': (Click here to show all)
A prime formed from summing n concatenated n times up to 158. I.e., 1 + 22 + 333 + ... + 158158158...158 (158 concatenated 158 times) is prime. [Earls]
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