Euler's formula & Euler's identity

Euler's Identity | Proof, Formula & Examples

Video of Euler's identity: the most beautiful of all equations | Britannica

Project Euler Problem 5 Solved with Javascript

Project Euler Problem 3 Solved with Javascript

Problem 9: The following two sub problems involve Euler' s Theorem Using Euler' s Theorem; find a number a between 0 and 9 such that a is congruent to 71000 mod 10. (note: this is the same as the last digit of the decimal expansion of 71000 (b) Using Euler's Theorem; find a number x between 0 and 28 with x 85 congruent to 6 modulo 35 (you should not use any brute-force searching)