List the common multiples of 3 and 7 up to 70

Question

ganeshie8 · Answer

whats the least common multiple(LCM) of 3 and 7 ?

undeadknight26 · Answer

Isn't that just 1?  Or did i get that wrong...Why am i so confused?

ikram002p · Answer

well 3,7 are both prime 
then the least common multible is . . .

ganeshie8 · Answer

@undeadknight26 greatest common factor of 3, 7 is 1

undeadknight26 · Answer

So i was right? or was i wrong...*itches head and falls asleep*

ganeshie8 · Answer

haha multiples of 3 are :   3, 9, 12, 15, 18, `21`, 24, etc.. 
multiples of 7 are : 7, 14, `21`, 28, etc...

ganeshie8 · Answer

clearly the first common multiple is `21` which is the LCM of 3 and 7

undeadknight26 · Answer

...I forgot what those were...so i was doing something else...I need to do some brain workouts...

ganeshie8 · Answer

you're doing a much related thing : common factors..

ganeshie8 · Answer

there are no common factors other than 1 for 3 and 7 as they both are prime numbers

ikram002p · Answer

so , we say
n( 21 )  for n $\in  N$  
and n(21 <70

shadowlegendx · Answer

Well explained @ganeshie8 I have been getting ignorant in common factors, multiples and such and this helped clear somethings up :)