Kaosar and Counting (Discussion)

1. MathModel•Jan 25, 2026, 6:24 PM•edited

   Funny but

   if you've one observation , the problem becomes simpler , ignore third element

   computing the sum of prefix euler totient is correct because we don't care about the third number , the difference is fixed

   and

   \gcd(a,a+x)=\gcd(a+x,a+2x)=\gcd(a,x)

   Which can be formulated with euler totient