Exactly which numbers can be expressed as sum of consec. pos

[ann]

Some numbers can be expressed as the sum of consecutive positive integers - for example: 9=2+3+4, 33=10+11+12, 15=1+2+3+4+5. Exactly which numbers have this property?

 

[stapel]

Some numbers can be expressed as the sum of consecutive positive integers - for example: 9=2+3+4, 33=10+11+12, 15=1+2+3+4+5. Exactly which numbers have this property?

By now you have no doubt read some of the many articles available online for this topic. What are your thoughts? What have you tried? Where are you stuck?

Please be complete. Thank you!

Eliz.