A089882 - OEIS

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A089882

Number of subsets of {1, ..., n} containing exactly one twin prime pair.

1

0, 0, 0, 0, 8, 16, 32, 64, 128, 256, 512, 1024, 768, 1536, 3072, 6144, 12288, 24576, 16384, 32768, 65536, 131072, 262144, 524288, 1048576, 2097152, 4194304, 8388608, 16777216, 33554432, 20971520, 41943040, 83886080, 167772160

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OFFSET

1,5

LINKS

Table of n, a(n) for n=1..34.

FORMULA

a(n) = ceiling(A089881(n)/2)*2^(n-A089881(n)).

CROSSREFS

Cf. A071538, A089827, A089828, A001359, A006512.

Sequence in context: A256817 A281016 A048169 * A335850 A206375 A146541

Adjacent sequences: A089879 A089880 A089881 * A089883 A089884 A089885

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Nov 13 2003

STATUS

approved