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A112785
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Members of twin prime pairs using only digits 7 and 9.
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0
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79997, 79999, 777977, 777979, 7977797, 7977799, 77997977, 77997979, 977999777, 977999779, 7979997797, 7979997799, 7999777997, 7999777999, 7999797977, 7999797979, 9977979797, 9977979799
(list; graph; refs; listen; history; internal format)
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