yaworsw/euler-manager

---
:id: 291
:name: Panaitopol Primes
:url: https://projecteuler.net/problem=291
:content: "A prime number <var>p</var> is called a Panaitopol prime if ![p291_formula.gif]({{
  images_dir }}/p291_formula.gif) for some positive integers  \n<var>x</var> and <var>y</var>.\n\nFind
  how many Panaitopol primes are less than 5×10<sup>15</sup>.\n\n"