SOLUTION: write the rule for the sequence 2, 9, 21, 38,...

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Question 713491: write the rule for the sequence 2, 9, 21, 38,...
Answer by josgarithmetic(39618) About Me  (Show Source):
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The difference appears to be prime numbers. That being a pattern is not a certain thing, but that's what the difference between consecutive terms gives. See plainly that the prime numbers demonstrated are not consecutive.

2 to 9 ---- 7
9 to 21 ---- 11
21 to 38 ---- 17

Those four numbers are not a pattern.