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A073897
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a(1) = 1, a(n) = smallest odd or even number not occurring earlier according as n is prime or composite.
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1
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1, 3, 5, 2, 7, 4, 9, 6, 8, 10, 11, 12, 13, 14, 16, 18, 15, 20, 17, 22, 24, 26, 19, 28, 30, 32, 34, 36, 21, 38, 23
(list; graph; refs; listen; history; internal format)
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