Discussion
The numbers below were generated by a rule that holds throughout. Discover the pattern and state the value the question mark conceals.
11, 13, 17, 19, 23, ?
Answer: A
Correct answer: 29
The gaps run 2, 4, 2, 4 and settle into no pattern at all, so no arithmetic step will fit. The terms are the prime numbers in order, each having no divisor but itself and one. The next prime after 23 is 29. As a check, every number between 23 and the answer has a divisor other than itself and one, so none of them could be the next term. Where the differences settle into no pattern at all, the terms usually share a property rather than a relationship.
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