Art of Problem Solving
AoPS Online
Math texts, online classes, and more
for students in grades 5-12.
Visit AoPS Online ‚
Books for Grades 5-12 Online Courses
Beast Academy
Engaging math books and online learning
for students ages 6-13.
Visit Beast Academy ‚
Books for Ages 6-13 Beast Academy Online
AoPS Academy
Small live classes for advanced math
and language arts learners in grades 2-12.
Visit AoPS Academy ‚
Find a Physical Campus Visit the Virtual Campus

Euc20205/Sub-Problem 1

Revision as of 04:24, 31 March 2023 by Tonyliu (talk | contribs)

(a) For each positive real number x, de ne $f(x)$ to be the number of prime numbers $p$ that satisfy $x \le p \le x + 10$. What is the value of $f(f(20))$?

Retrieved from "https://artofproblemsolving.com/wiki/index.php?title=Euc20205/Sub-Problem_1&oldid=191619"