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A147820
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Nearest-neighbors of odd primes, divided by 2.
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1
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1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 18, 19, 20, 21, 22, 23, 24, 26, 27, 29, 30, 31, 33, 34, 35, 36, 37, 39, 40, 41, 42, 44, 45, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 63, 64, 65, 66, 68, 69, 70, 74, 75, 76, 78, 79, 81
(list; graph; refs; listen; history; internal format)
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