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|Release date||28 May 2002 (Update)|
|Quest NPC?||Monk's Friend|
|Location||Monastery south of Ardougne|
| An old monk.|
Brother Omad's riddle involves the prime number sequence, with the prefix of 1 before each number (12, 13, 15, 17, 111, 113, 117, 119, 123). With the first 10 prime numbers being 2, 3, 5, 7, 13, 17, 19, 23 and the final being 29, leading to the answer of 129.