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A023304 Numbers n such that n remains prime through 4 iterations of function f(x) = 2x + 5. +0
3
13, 31, 181, 541, 661, 1087, 1861, 2179, 2719, 3727, 7459, 8089, 8707, 9109, 10639, 17341, 19333, 22501, 23293, 29287, 32797, 39847, 40387, 42703, 46591, 51613, 53101, 56149, 56809, 57829, 59233, 80779, 87643, 89113, 89413, 91291, 93979, 94261, 98899 (list; graph; listen)
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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.


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