Medium
Pattern Recognition Riddles
15 XP

The Roman Riddle

19,620 solved 76% solve rate 24% fail rate
What is next in: I, IV, IX, XVI, XXV, ?
Only 76% solve this correctly
19,620 attempts
Earn +15 XP for solving
Quick Answer & Explanation
XXXVI

The answer to this riddle is XXXVI. Difficulty: Medium · Solved by 19,620 puzzle lovers.

XXXVI (36). The sequence is 1, 4, 9, 16, 25, 36 — perfect squares.
← The Power Sequence The Triangular Number →

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