41, 80 and 320?

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- Jul 19th 2010, 11:56 AMwonderboy1953What do these numbers have in common?
41, 80 and 320?

- Jul 19th 2010, 07:42 PMSoroban

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

. .

- Jul 19th 2010, 07:43 PMbigblackbronco
they can all be / by 1

- Jul 20th 2010, 07:12 AMSoroban

Don't know how I missed that . . .

Quote:

Originally Posted by**bigblackbronco**

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

. .

- Jul 20th 2010, 11:14 AMwonderboy1953
Keep going.

- Jul 20th 2010, 03:24 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) - Jul 20th 2010, 05:20 PMwonderboy1953
- Aug 2nd 2010, 09:23 AMChokfull