What is "Σ-Math Calculator"?

Σ-Math Calculator is a math site that offer you online math calculators to help you to solve algebra exercises with a step-by-step explanation and an user-friendly interface ;)

In Evidence

PowerMod Calculator

There are several ways to compute $$a^b \, \text{mod} \, n$$. The most efficient method consists of:
Step 1) divide the exponent $$b$$ into powers of 2 by writing it in binary, obtaining $$b = (d_{k-1},d_{k-2},...,d_1,d_0$$).
$$a$$ and $$b$$ are two integers, with $$0 \leq b < a$$.
Step 1) if $$b=0$$ then $$GCD(a,b) = 0$$.
Step 2) if $$b \neq 0$$ then you proceed with the successive divisions: ... (click here)