71

This number is a prime.

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Jeffery Marshall © 2002

71 divides the sum of digits of the first 71 prime numbers, i.e., 71 divides (2 + 3 + 5 + 7 + 1+1 + … + 3+4+9 + 3+5+3) or 710. The sequence of such primes begin as 71, 367, 373, 9119749, ... . See PC42. [Sariyar]