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A045963
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Numbers k in A045954 such that 2*k-1 is prime.
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2
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2, 4, 6, 10, 12, 22, 34, 36, 42, 52, 54, 70, 76, 84, 90, 100, 114, 132, 234, 244, 246, 262, 282, 300, 310, 324, 346, 372, 394, 406, 420, 442, 474, 516, 532, 546, 586, 630, 642, 646, 660, 684, 714, 724, 742, 772, 780, 790, 804, 874, 906, 916, 954, 966, 994, 1002, 1044
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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seq[max_] := Module[{lst = Range[2, max, 2], i = 2, len}, While[i <= (len = Length@lst) && (k = lst[[i]]) <= len, lst = Drop[lst, {k, len, k}]; i++]; Select[lst, PrimeQ[2*# - 1] &]]; seq[1000] (* Amiram Eldar, Mar 20 2024, after Robert G. Wilson v at A045954 *)
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CROSSREFS
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KEYWORD
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nonn,changed
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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