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A210939 Nonprime nearest-neighbors of the primes. 1
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Essentially the same as A147819. R. J. Mathar, Jun 25 2012
LINKS
MATHEMATICA
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 *)
CROSSREFS
Nonprimes in A045718.
Sequence in context: A360127 A111305 A284665 * A175246 A353537 A134928
KEYWORD
nonn
AUTHOR
Omar E. Pol, Apr 17 2012
STATUS
approved

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Last modified March 29 01:36 EDT 2024. Contains 371264 sequences. (Running on oeis4.)