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A095017
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Number of lesser twin primes (A001359) in range ]2^n,2^(n+1)].
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0
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1, 1, 1, 2, 2, 3, 7, 7, 12, 26, 45, 70, 113, 215, 355, 666, 1153, 2071, 3785, 6965, 12495, 22643, 41608, 76371, 140944, 261752, 484968, 904799, 1689477, 3160113, 5928904, 11139071, 20970782
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OFFSET
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1,4
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COMMENTS
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Conjecture: a(n) > 0 for all n. This holds for all n <= 100. - Charles R Greathouse IV, May 14 2012
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LINKS
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Table of n, a(n) for n=1..33.
A. Karttunen and J. Moyer, C-program for computing the initial terms of this sequence
Index entries for sequences related to occurrences of various subsets of primes in range ]2^n,2^(n+1)]
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MATHEMATICA
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Table[ps = Prime[Range[PrimePi[2^n] + 1, PrimePi[2^(n+1) + 1]]]; Count[Differences[ps], 2], {n, 25}] (* T. D. Noe, May 08 2012 *)
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CROSSREFS
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Cf. A095016, A036378.
Sequence in context: A068519 A083702 A108041 * A141559 A211395 A160433
Adjacent sequences: A095014 A095015 A095016 * A095018 A095019 A095020
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KEYWORD
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nonn
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AUTHOR
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Antti Karttunen and Labos E. (labos(AT)ana.sote.hu), Jun 01 2004
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STATUS
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approved
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