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Search: id:A104191
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| A104191 |
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Sum of Euler totient function between successive powers of two. |
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+0
1
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| 1, 3, 14, 54, 236, 920, 3730, 14862, 59776, 238856, 956110, 3823410, 15299542, 61193632, 244779854, 979111158, 3916558030, 15666093384, 62664665094, 250658276292
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OFFSET
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0,2
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FORMULA
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a(n) = Sum[EulerPhi[i], {i, 2^n, 2^(n+1)-1}]
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MATHEMATICA
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b = Table[Sum[EulerPhi[i], {i, 2^n, 2^(n + 1) - 1}], {n, 0, 24}]
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CROSSREFS
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Adjacent sequences: A104188 A104189 A104190 this_sequence A104192 A104193 A104194
Sequence in context: A017946 A083424 A099487 this_sequence A026544 A026527 A037786
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KEYWORD
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nonn
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AUTHOR
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R. L. Bagula (rlbagulatftn(AT)yahoo.com), Mar 12 2005
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