
Curios:
Curios Search:
Participate: 
2^{2} + 3! + 5! + 7^{2}  11  13 = 155. [Russ] 155 is the only threedigit number such that 155^155155+1 is prime. [Opao] The sum of primes between smallest and largest prime factor of itself. [Post] 155 = prime(1+5+5) * (1+5+5). It is the smallest number of this form. [Bajpai]
Prime Curios! © 20002018 (all rights
reserved)
privacy statement
