What is the Least Common Multiple of 1261 and 1281?

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 1261 and 1281 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1261 and 1281, than apply into the LCM equation.

GCF(1261,1281) = 1
LCM(1261,1281) = ( 1261 × 1281) / 1
LCM(1261,1281) = 1615341 / 1
LCM(1261,1281) = 1615341

Least Common Multiple (LCM) of 1261 and 1281 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1261 and 1281. First we will calculate the prime factors of 1261 and 1281.

Prime Factorization of 1261

Prime Factorization of 1281

Now multiplying the highest exponent prime factors to calculate the LCM of 1261 and 1281.

LCM(1261,1281) = 13¹ × 97¹ × 3¹ × 7¹ × 61¹
LCM(1261,1281) = 1615341