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A089750
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a(n) = the first prime in the orbit of n under f(n) = n + the first prime > n, or 0 if no such prime exists.
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0
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3, 2, 3, 43, 5, 13, 7, 19, 43, 379, 11, 113, 13, 31, 18749, 2341, 17, 37, 19, 43, 379, 788941, 23, 53, 113, 241, 511213, 4089763, 29, 61, 31, 18749, 2341, 71, 601, 73, 37, 79, 163, 331, 41, 353, 43, 379, 788941
(list; graph; refs; listen; history; internal format)
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