

This page describes the notation used in problems/solutions from the book "250 Problems in Elementary Number Theory"
Symbol/Abbreviation  Word form  Example usage  Meaning 
  "divides"  a  b  Integer divisibility. a divides b means b is divisible by a 
¬  "does not divide"  a ¬ b  Integer indivisibility. a ¬ b means b is not divisible by a 
≤  "less than or equal to"  a ≤ b  Integer comparison. a ≤ b means b is less than or equal to b 


