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A111070
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Twin prime pairs using digits 1 and 3 only. a(2k) = a(2k-1) + 2. Both the members of the twin prime pairs are included.
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11, 13, 311, 313, 131111, 131113, 313331, 313333, 1131131, 1131133, 3331331, 3331333, 3333131, 3333133, 3333311, 3333313, 111113111, 111113113, 113331311, 113331313, 331313111, 331313113, 331331111, 331331113, 333331331, 333331333
(list; graph; refs; listen; history; internal format)
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