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A054257
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Concatenation of n in base 10 down up to base 2 is prime, all numbers are interpreted as decimals.
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3
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21, 117, 241, 283, 389, 517, 547, 627, 1219, 1223, 1247, 1285, 1287, 1323, 1467, 1505, 1591, 1599, 1689, 1713, 1817, 1961, 2203, 2309, 2377, 2607, 2837, 2847, 2899, 2911, 3227, 3261, 3499, 3823, 4007, 4069, 4183, 4347, 4403, 4473, 4507, 4535, 4637
(list; graph; refs; listen; history; internal format)
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