Brain Teasers
1, 3, 7...
Complete the following series.
1, 3, 7, 13, 21, 31, ?, ?
1, 3, 7, 13, 21, 31, ?, ?
Answer
The next numbers are 43 and 57.(6*6)+6+1=43
(7*7)+7+1=57
Hide Answer Show Answer
What Next?
View a Similar Brain Teaser...
If you become a registered user you can vote on this brain teaser, keep track of which ones you have seen, and even make your own.
Solve a Puzzle
Comments hidden to avoid spoilers.
Follow Braingle!