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A242767 Numbers of repetitions of terms in A242758. 8


%S 1,1,2,2,3,3,4,3,6,2,5,2,6,2,2,4,3,5,3,4,5,12,2,6,9,6,5,4,3,4,20,2,2,

%T 4,4,19,2,3,2,4,8,11,5,3,3,3,10,5,4,2,17,3,6,3,3,9,9,2,6,2,6,5,6,2,3,

%U 2,3,9,4,7,3,7,20,4,7,6,5,3,7,3,20,2,14,4

%N Numbers of repetitions of terms in A242758.

%C If {p<q} is a pair of twin primes, then the number p+3=q+1 is in A242758. If this number occurs k times in A242758, then we say that k is the index of the pair of twin primes {p,q} with p in A001359.

%C Is this the same as A027833 shifted by two indices? - _R. J. Mathar_, May 23 2014

%H Peter J. C. Moses, <a href="/A242767/b242767.txt">Table of n, a(n) for n = 2..5001</a>

%F From the construction of A242758, in supposition of an infinity of twin primes, we have a(2)=1; for n>=3, a(n) = A027833(n-2). Otherwise, A027833 is finite, while A242758 will coincide with A242720 after the last pair of twin primes. - _Vladimir Shevelev_, May 26 2014

%Y Cf. A001359, A006512, A242489, A242490, A242720, A242758.

%K nonn

%O 2,3

%A _Vladimir Shevelev_, May 22 2014

%E More terms from _Peter J. C. Moses_, May 22 2014

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Last modified August 6 19:52 EDT 2020. Contains 336256 sequences. (Running on oeis4.)