22*5*13 = 260
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The prime factorization of 260 in exponential form is written as: 22 x 5 x 13
5*2*2*13
Well, honey, the least common multiple (LCM) of 260 and 390 is 780. You see, 260 is 2 times 2 times 5 times 13, while 390 is 2 times 3 times 5 times 13. So, the LCM is just the product of all the unique prime factors with the highest power they appear in either number. Easy peasy lemon squeezy!
All the prime numbers between 230 and 260 are; 233, 239, 241, 251, and 257.
260.... without using a calculator !