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A028987
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Repdigit - 1 is prime (next term is 88...8 (72 digits)).
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14
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3, 4, 6, 8, 44, 444, 888, 2222, 8888, 444444, 888888, 444444444, 888888888, 444444444444, 888888888888, 222222222222222222, 444444444444444444444444444444, 44444444444444444444444444444444
(list; graph; refs; listen; history; internal format)
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