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A110674
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Numbers n such that the string 1111n is prime.
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0
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3, 7, 9, 19, 21, 27, 43, 49, 87, 91, 151, 157, 169, 181, 183, 189, 211, 213, 219, 247, 259, 283, 289, 301, 333, 339, 351, 361, 379, 393, 399, 423, 427, 433, 447, 457, 489, 493, 499, 531, 543, 547, 553, 559, 573, 577, 637, 639, 651, 661, 667, 673, 687, 703, 711
(list; graph; refs; listen; history; internal format)
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