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A158019 Numbers such that (n-1)/2 amd 10*n-1 are both prime. +0
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11, 15, 23, 27, 35, 39, 83, 107, 123, 143, 167, 179, 195, 203, 207, 227, 255, 275, 279, 347, 399, 423, 455, 479, 567, 587, 623, 627, 695, 707, 735, 759, 767, 779, 795, 839, 843, 863, 867, 935, 975, 983, 1007, 1043, 1095, 1115, 1155, 1215, 1227, 1283, 1323 (list; graph; listen)
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Last modified November 27 14:17 EST 2009. Contains 167569 sequences.


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