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HINT: The rule involves prime numbers.

See Answer

ANSWER: The sequence consists of successive prime numbers beginning at 17 incremented by 1.

EXPLANATION: The list of prime numbers (beginning with 17) is: 17, 19, 23, 29, 31, 37, 41. Adding 1 to each of those numbers, yields the sequence: 18, 20, 24, 30, 32, 38, 42.

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