If you arrange the first 12 primes into exponentiated summands, you get a prime number:

2³ + 5⁷ + 11¹³ + 17¹⁹ + 23²⁹ + 31³⁷ = 15148954872646850196557152427604893685308877022260348791 is prime.

(From Fermat’s Library.)