Search: id:A023200
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%I A023200
%S A023200 3,7,13,19,37,43,67,79,97,103,109,127,163,193,223,229,277,307,313,349,
%T A023200 379,397,439,457,463,487,499,613,643,673,739,757,769,823,853,859,877,
%U A023200 883,907,937,967,1009,1087,1093,1213,1279,1297,1303,1423,1429,1447,1483
%N A023200 Primes p such that p and p + 4 are both primes.
%C A023200 Smaller member p of cousin prime pairs (p, p+4).
%C A023200 A015913 contains the composite number 305635357, so is different from 
               the present sequence and A029710 (305635357 is the only composite 
               member of A015913 < 10^9) - Jud McCranie (j.mccranie(AT)comcast.net), 
               Jan 07, 2001.
%H A023200 T. D. Noe, <a href="b023200.txt">Table of n, a(n) for n=1..10000</a>
%H A023200 A. Granville and G. Martin, <a href="http://www.arXiv.org/abs/math.NT/
               0408319">Prime number races</a>
%H A023200 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               CousinPrimes.html">Cousin Primes</a>
%H A023200 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               TwinPrimes.html">Twin Primes</a>
%H A023200 <a href="Sindx_Pri.html#gaps">Index entries for primes, gaps between</
               a>
%F A023200 a(n) = A046132(n) - 4 = A087679(n) - 2.
%t A023200 Select[Range[10^2], PrimeQ[ # ]&&PrimeQ[ #+4] &] (from Vladimir Orlovsky 
               (4vladimir(AT)gmail.com), Apr 29 2008)
%Y A023200 Essentially the same as A029710.
%Y A023200 Cf. A000010, A003557, A007947, A046132, A098429.
%Y A023200 Sequence in context: A048977 A154650 A015913 this_sequence A046136 A098044 
               A134765
%Y A023200 Adjacent sequences: A023197 A023198 A023199 this_sequence A023201 A023202 
               A023203
%K A023200 nonn
%O A023200 1,1
%A A023200 David W. Wilson (davidwwilson(AT)comcast.net)
%E A023200 Definition corrected by Vincenzo Librandi (vincenzo.librandi(AT)tin.it), 
               Aug 02 2009

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