What is the Least Common Multiple of 247 and 257?

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 of 247 and 257 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 247 and 257, than apply into the LCM equation.

GCF(247,257) = 1
LCM(247,257) = ( 247 × 257) / 1
LCM(247,257) = 63479 / 1
LCM(247,257) = 63479

Least Common Multiple (LCM) of 247 and 257 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 247 and 257. First we will calculate the prime factors of 247 and 257.

Prime Factorization of 247

Prime Factorization of 257

Now multiplying the highest exponent prime factors to calculate the LCM of 247 and 257.

LCM(247,257) = 13¹ × 19¹ × 257¹
LCM(247,257) = 63479