This number is a prime.
Just showing those entries submitted by 'Capelle': (Click here to show all)
72 + 82 + ... + 282 + 292 is a square. [Capelle]
The largest natural number n for which the sum of digits is not smaller than n/3. [Capelle]
Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell