# What is the Least Common Multiple of 17 and 23?

*Least common multiple* or lowest common denominator (lcd) can be calculated in two way; with the LCM formula calculation of greatest common factor (GCF), or multiplying the prime factors with the highest exponent factor.

Least common multiple (LCM) of 17 and 23 is **391**.

LCM(17,23) = 391

## Least Common Multiple of 17 and 23 with GCF Formula

The formula of **LCM** is LCM(a,b) = ( a × b) / GCF(a,b).

We need to calculate greatest common factor 17 and 23, than apply into the LCM equation.

GCF(17,23) = 1

LCM(17,23) = ( 17 × 23) / 1

LCM(17,23) = 391 / 1

LCM(17,23) = 391

## Least Common Multiple (LCM) of 17 and 23 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 17 and 23. First we will calculate the **prime factors of 17 and 23**.

### Prime Factorization of 17

Prime factors of 17 are 17. Prime factorization of **17** in exponential form is:

17 = 17^{1}

### Prime Factorization of 23

Prime factors of 23 are 23. Prime factorization of **23** in exponential form is:

23 = 23^{1}

Now multiplying the highest exponent prime factors to calculate the **LCM of 17 and 23**.

LCM(17,23) = 17^{1} × 23^{1}

LCM(17,23) = 391