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A048989
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Numbers n such that pi(n) is prime.
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3
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3, 4, 5, 6, 11, 12, 17, 18, 31, 32, 33, 34, 35, 36, 41, 42, 59, 60, 67, 68, 69, 70, 83, 84, 85, 86, 87, 88, 109, 110, 111, 112, 127, 128, 129, 130, 157, 158, 159, 160, 161, 162, 179, 180, 191, 192, 211, 212, 213, 214, 215, 216, 217, 218, 219
(list; graph; refs; listen; history; internal format)
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