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 A105549 Numbers n such that 2*prime(n)+/-n are primes. 1
 1, 3, 15, 27, 33, 45, 81, 189, 213, 243, 249, 279, 285, 291, 381, 423, 567, 615, 675, 687, 705, 813, 819, 1023, 1071, 1077, 1137, 1173, 1347, 1425, 1431, 1503, 1737, 1779, 1785, 1815, 1857, 1989, 1995, 2049, 2067, 2163, 2241, 2373, 2565, 2841 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 MATHEMATICA bb={}; Do[If[PrimeQ[2 Prime[n]+n]&&PrimeQ[2 Prime[n]-n], bb=Append[bb, n]], {n, 1, 3000, 2}]; bb Select[Range[3000], And@@PrimeQ[2Prime[#]+{#, -#}]&] (* Harvey P. Dale, Apr 07 2013 *) CROSSREFS Sequence in context: A027179 A110703 A121250 * A080065 A017557 A147041 Adjacent sequences: A105546 A105547 A105548 * A105550 A105551 A105552 KEYWORD nonn AUTHOR Zak Seidov, May 03 2005 STATUS approved

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Last modified April 14 18:28 EDT 2024. Contains 371667 sequences. (Running on oeis4.)