/sci/ - Science & Math

Wouldn't a manned super sonic ramjet propulsion aircraft, that uses a propeller power plant to rise to high altitude - subsonic obviously - then activate the ram jet and dive to super sonic speeds to help overcome wave drag to level super sonic flight, be really fucking cool?

Hello guys

I have number N and want to find the LCM of all numbers from 1->20.

I figured out this methodology seems to work but cant figure out why?

First I find all the primes starting from 5 -> 20, which means this is 5,7,11,13,17.

Multiply them all together and get a lower bound for N.

Now this is the magic that I dont understand.
I take the floor of 2nd root of 20 and then floor of 3rd root of 20.

This gives me 2**4 and 3**2 multiplied by my previous lower bound.

This seems to work for me every time, I don't know if its mathematically consistent or a coincidence.

I just want to know why this works, why can a combination of 2's and 3's describe all missing factors of my number N?

Thank ypou

>>8441972
agre

>>7916468
This desu. Can't get any swaggier than praying to a 6 titties goddess, smonking some blow, and then deriving equations out your ass.

>>7915196
dem titties