41, 80 and 320?

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- July 19th 2010, 10:56 AMwonderboy1953What do these numbers have in common?
41, 80 and 320?

- July 19th 2010, 06:42 PMSoroban

Um . . . Their binary representations begin with "101" ?

. .

- July 19th 2010, 06:43 PMbigblackbronco
they can all be / by 1

- July 20th 2010, 06:12 AMSoroban

Don't know how I missed that . . .

Quote:

Originally Posted by**bigblackbronco**

And I wasted all that time looking for patterns . . . *sigh*

. .

- July 20th 2010, 10:14 AMwonderboy1953
Keep going.

- July 20th 2010, 02:24 PMeumyang
If you add the three numbers you get a perfect square:

And... if you add any two of the numbers you also get perfect squares:

If it wasn't for Soroban's last post I wouldn't have thought of this. (Bow) - July 20th 2010, 04:20 PMwonderboy1953
- August 2nd 2010, 08:23 AMChokfull