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A159475
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a(1) = 1; for n >= 1, a(n) = smallest number m > n such that gcd(n,m) > 1.
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1, 4, 6, 6, 10, 8, 14, 10, 12, 12, 22, 14, 26, 16, 18, 18, 34, 20, 38, 22, 24, 24, 46, 26, 30, 28, 30, 30, 58, 32, 62, 34, 36, 36, 40, 38, 74, 40, 42, 42, 82, 44, 86, 46, 48, 48, 94, 50, 56, 52
(list; graph; refs; listen; history; internal format)
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