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Search: id:A050714
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A050714 Inserting a digit '4' between adjacent digits of n makes a prime. +0
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19, 21, 37, 39, 43, 49, 51, 57, 61, 63, 67, 73, 91, 97, 113, 119, 123, 129, 131, 137, 147, 149, 153, 159, 171, 177, 183, 197, 203, 209, 227, 243, 257, 279, 281, 287, 293, 311, 317, 353, 359, 369, 377, 381, 383, 387, 389, 399, 401, 429, 449, 453, 459, 461, 467 (list; graph; listen)
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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.


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