# Concept derivation guides

299 concept teaching guides, separate from the 36,000 individual question derivations.

[Search all questions & derivations →](/en/explore/)

1 1 results · Page 1 of 1



Concept guide



## [The first power returning to one](/en/derivations/derivation-mko-multiplicative-order-mod-n-01/?from=%2Fen%2Fderivations%2F%3Fq%3Dmko-multiplicative-order-mod-n)

ord_8(-5)=ord_8(3)=2, with phi(8)=4 and 2 dividing 4 but not equal to it.

Multiplicative order modulo n

derivation-mko-multiplicative-order-mod-n-01





1 1 results · Page 1 of 1