29

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]

3²⁹ - 2²⁹ is prime. [Capelle]

The largest natural number n for which the sum of digits is not smaller than n/3. [Capelle]