Medium
Pattern Recognition Riddles
16 XP

The Triangular Number

6,365 solved 53% solve rate 47% fail rate
What comes next: 1, 3, 6, 10, 15, 21, ?
Only 53% solve this correctly
6,365 attempts
Earn +16 XP for solving
Quick Answer & Explanation
28

The answer to this riddle is 28. Difficulty: Medium ยท Solved by 6,365 puzzle lovers.

The differences increase by 1 each time.
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