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A137367 Subset of A037165 (p(n)*p(n+1)-p(n)-p(n+1)) for twin primes. 2

%I #6 Jun 14 2014 14:19:58

%S 7,23,119,287,839,1679,3479,5039,10199,11447,18767,22199,32039,36479,

%T 38807,51527,57119,72359,78959,96719,120407,175559,185759,212519,

%U 271439,323759,358799,380687,410879,434279,654479,674039,683927,734447,776159

%N Subset of A037165 (p(n)*p(n+1)-p(n)-p(n+1)) for twin primes.

%H Harvey P. Dale, <a href="/A137367/b137367.txt">Table of n, a(n) for n = 1..1000</a>

%e 3*5-3-5=7, 5*7-5-7=23, 11*13-11-13=119.

%t ss={7};Do[If[PrimeQ[p1=6m-1]&&PrimeQ[p2=6m+1],p=-1-12 m+36 m^2;AppendTo[ss,p]],{m,300}];ss

%t Times@@#-Total[#]&/@Select[Partition[Prime[Range[200]],2,1],#[[2]]-#[[1]] == 2&] (* _Harvey P. Dale_, Jun 14 2014 *)

%Y Cf. A037165.

%K nonn

%O 1,1

%A _Zak Seidov_, Apr 09 2008

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Last modified June 24 08:39 EDT 2024. Contains 373663 sequences. (Running on oeis4.)