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A103018
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Numbers n such that 5*10^n + 6*R_n + 3 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
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1
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1, 2, 3, 10, 25, 29, 34, 73, 76, 77, 651, 884, 938, 1252, 1893, 3342, 4034, 6168, 6216, 6231, 6812, 11046, 15448, 16628, 16918, 18734
(list; graph; refs; listen; history; internal format)
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