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A153740 Smallest non-twin prime > n-th and (n+1)-th twin primes. 1

%I #6 Nov 21 2013 12:49:29

%S 23,37,47,67,79,113,157,211,233,251,277,293,317,353,439,467,541,577,

%T 607,631,647,673,839,863,887,1039,1069,1097,1163,1237,1283,1297,1307,

%U 1327,1433,1459,1493,1613,1627,1693,1709,1733,1801,1889,1973,2003,2039,2099

%N Smallest non-twin prime > n-th and (n+1)-th twin primes.

%H Harvey P. Dale, <a href="/A153740/b153740.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[NextPrime/@Transpose[Select[Partition[Prime[Range[500]],2,1], Last[#]-First[#] == 2&]][[2]],!PrimeQ[#-2]&&!PrimeQ[#+2]&] (* _Harvey P. Dale_, Feb 25 2012 *)

%Y Cf. A000040, A077800.

%K nonn

%O 1,1

%A _Juri-Stepan Gerasimov_, Dec 31 2008

%E 863 inserted by _R. J. Mathar_, Jan 03 2009

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Last modified August 13 02:28 EDT 2024. Contains 375113 sequences. (Running on oeis4.)