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A068681
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Primes formed by the concatenation n, n-2, n.
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1
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313, 757, 131113, 171517, 312931, 393739, 474547, 494749, 575557, 939193, 111109111, 127125127, 139137139, 147145147, 151149151, 169167169, 189187189, 213211213, 217215217, 227225227, 237235237, 239237239, 247245247, 253251253, 269267269, 331329331, 333331333, 353351353, 363361363, 377375377, 387385387, 389387389, 393391393
(list; graph; refs; listen; history; internal format)
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