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A324913
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a(n) = Sum_{k=1..n} 2^k * phi(k), where phi is the Euler totient function A000010.
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1
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2, 6, 22, 54, 182, 310, 1078, 2102, 5174, 9270, 29750, 46134, 144438, 242742, 504886, 1029174, 3126326, 4699190, 14136374, 22524982, 47690806, 89633846, 274183222, 408400950, 1079489590, 1884795958, 4300715062, 7521940534, 22554326070, 31144260662, 95568770102
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Accumulate[Table[2^k*EulerPhi[k], {k, 1, 40}]]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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