
Curios:
Curios Search:
Participate: 
Just showing those entries submitted by 'Moser': (Click here to show all) There are only 8 positive integers n for which the number of primes < n (pi(n)) equals the number of positive integers < n relative prime to n (phi(n)). They are 2, 3, 4, 8, 10, 14, 20, and 90. [Moser]
Prime Curios! © 20002017 (all rights
reserved)
