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A210939
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Nonprime nearest-neighbors of the primes.
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1
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1, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 28, 30, 32, 36, 38, 40, 42, 44, 46, 48, 52, 54, 58, 60, 62, 66, 68, 70, 72, 74, 78, 80, 82, 84, 88, 90, 96, 98, 100, 102, 104, 106, 108, 110, 112, 114, 126, 128, 130, 132, 136, 138, 140, 148, 150, 152, 156
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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[156], ! PrimeQ[#] && (PrimeQ[# - 1] || PrimeQ[# + 1]) &] (* T. D. Noe, Apr 18 2012 *)
Join[{1}, Flatten[#+{-1, 1}&/@Prime[Range[3, 40]]]//Union] (* Harvey P. Dale, Oct 22 2022 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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