84

This number is a composite.

Just showing those entries submitted by 'Russ': (Click here to show all)

Its digits are composite. Yet each digit minus 1, the sum of the digit minus 1 and the absolute value of the difference of the digits minus 1 is prime. [Russo]

84 is the smallest number that can be expressed as the sum of 3 distinct primes raised to distinct prime exponents (2⁵ + 3³ + 5²). [Russ]