Crayons

Five friends A, B, C, D and E has come to a shop to buy crayons for their art project. They need cra...

Phi Numbers in Range!

In number theory, Euler’s phi function, denoted as ϕ(n), is an arithmetic function which counts the ...

New Divisor Problem

In mathematics, a divisor of an integer n, also called a factor of n, is an integer m that may be mu...

Taju Kage Bunshin No Jutsu

Naruto Uzumaki is one of the strongest ninja of RUET (Rasengan University of Ebisu and Tobi), posses...