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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
OFFSET
1,5
FORMULA
a(n) = ceiling(A089881(n)/2)*2^(n-A089881(n)).
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Nov 13 2003
STATUS
approved