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A086172
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Numbers n such that n*prime(n)+1 is prime.
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11
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1, 2, 4, 6, 24, 30, 36, 42, 72, 84, 98, 100, 116, 126, 128, 144, 162, 174, 206, 212, 228, 288, 312, 318, 324, 336, 350, 360, 406, 408, 416, 418, 452, 458, 466, 498, 510, 522, 528, 530, 536, 546, 548, 556, 604, 654, 660, 666, 682, 684, 690, 708, 710, 728, 738
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OFFSET
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1,2
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COMMENTS
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LINKS
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MATHEMATICA
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Select[Range[1000], PrimeQ[ # Prime[ # ]+1]&]
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PROG
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(Magma) [n: n in [1..800] | IsPrime(n*NthPrime(n) + 1)]; // Vincenzo Librandi, Oct 05 2012
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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