Test your skills with numbers with this numerical riddle.
Find The Next Number in the following series;
12, 13, 15, 17, 111, 113, 117, 119, 123, ?
So were you able to solve the riddle? Leave your answers in the comment section below.
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These are the first 10 prime numbers (2, 3, 5…) prefixed with a 1.
Therefore, answer = 129.