Panaitopol Primes
Problem 291
Published on Friday, 7th May 2010, 09:00 pm; Solved by 705
A prime number p is called a Panaitopol prime if 
for some positive integers
x and y.
Find how many Panaitopol primes are less than 5
1015.
A prime number p is called a Panaitopol prime if for some positive integers
x and y.
Find how many Panaitopol primes are less than 51015.