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A175511
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n-th even semiprime minus n-th semiprime.
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1
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0, 0, 1, 4, 8, 11, 13, 16, 21, 32, 29, 40, 47, 48, 55, 60, 69, 71, 79, 85, 88, 96, 101, 109, 120, 125, 124, 129, 132, 139, 163, 169, 180, 183, 192, 191, 199, 208, 215, 225, 236, 239, 253, 253, 260, 257, 280, 303, 309, 312, 311, 320, 323, 341, 348, 357, 361, 364
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OFFSET
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1,4
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LINKS
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FORMULA
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MATHEMATICA
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Module[{sps=Select[Range[600], PrimeOmega[#]==2&], evs}, evs= Select[ sps, EvenQ]; #[[1]]-#[[2]]&/@Thread[{evs, Take[sps, Length[evs]]}]] (* Harvey P. Dale, Sep 07 2012 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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