19
This number is a prime.
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10/1 + 10/3 + 10/6 + ... + 10/171 + 10/190 = 19. Note that the denominators are the first 19 triangular numbers. [Petrov]
Submitted: 2018-11-17 13:40:35; Last Modified: 2019-01-30 22:36:49.
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