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A242767 Numbers of repetitions of terms in A242758. 8
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, 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, 2, 3, 9, 4, 7, 3, 7, 20, 4, 7, 6, 5, 3, 7, 3, 20, 2, 14, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,3

COMMENTS

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.

Is this the same as A027833 shifted by two indices? - R. J. Mathar, May 23 2014

LINKS

Peter J. C. Moses, Table of n, a(n) for n = 2..5001

FORMULA

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

CROSSREFS

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

Sequence in context: A289777 A182921 A291268 * A027833 A110676 A117171

Adjacent sequences:  A242764 A242765 A242766 * A242768 A242769 A242770

KEYWORD

nonn

AUTHOR

Vladimir Shevelev, May 22 2014

EXTENSIONS

More terms from Peter J. C. Moses, May 22 2014

STATUS

approved

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Last modified July 16 08:37 EDT 2020. Contains 335781 sequences. (Running on oeis4.)