| 5, 9, 15, 21, 39, 45, 69, 81, 99, 105, 111, 129, 165, 195, 225, 231, 279, 309, 315, 351, 381, 399, 441, 459, 465, 489, 501, 615, 645, 675, 741, 759, 771, 825, 855, 861, 879, 885, 909, 939, 969, 1011, 1089, 1095, 1215, 1281, 1299, 1305, 1425, 1431, 1449, 1485
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Midpoint of cousin prime pairs.
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LINKS
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Eric Weisstein's World of Mathematics, Cousin Primes
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FORMULA
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a(n) = (A023200(n) + A046132(n))/2 = A023200(n) + 2 = A046132(n) - 2.
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MAPLE
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ZL:=[]:for p from 1 to 1485 do if (isprime(p) and isprime(p+4) ) then ZL:=[op(ZL), (p+(p+4))/2]; fi; od; print(ZL); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 07 2007
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CROSSREFS
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Essentially the same as A029708.
Cf. A014574, A087678-A087683, A087695-A087697, A088762.
Sequence in context: A059655 A063093 A095948 this_sequence A075343 A102176 A025005
Adjacent sequences: A087676 A087677 A087678 this_sequence A087680 A087681 A087682
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KEYWORD
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easy,nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Sep 27 2003
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EXTENSIONS
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More terms from Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 26 2003
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