4

This number is a composite.

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

Four fours raised to the fourth power plus one is prime. I.e., 4444^4+1 is prime. [Opao]

4 fives plus five 4's is prime. [Opao]

The largest value for n less than 10⁵, such that p = 2ⁿ + 3ⁿ is prime. [Opao]