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A137929
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If n = the k-th prime power (including 1), then a(n) = the (k+1)th prime power. If n = the k-th positive integer that is not a prime power, then a(n) = the (k+1)th positive integer that is not a prime power.
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1
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2, 3, 4, 5, 7, 10, 8, 9, 11, 12, 13, 14, 16, 15, 18, 17, 19, 20, 23, 21, 22, 24, 25, 26, 27, 28, 29, 30, 31, 33
(list; graph; refs; listen; history; internal format)
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