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3, 5, 13, 33, 105, 345, 1173, 4097, 14573, 52433, 190653, 699073, 2581113, 9586985, 35791473, 134217729, 505290273, 1908874585, 7233629133, 27487790721, 104715393913, 399822410105, 1529755308213, 5864062017537, 22517998136937, 86607685141745
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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FORMULA
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See Karhumäki et al. (2016), Proposition 7.4.
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MATHEMATICA
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Table[a=Select[Divisors[n], OddQ[#]&]; (1 + Apply[Plus, 2^(n/a)EulerPhi[a]]/n), {n, 2, 52, 2}] (* Vincenzo Librandi, Mar 29 2017 *)
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PROG
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(PARI) a(n) = my(m = 2*n); 1 + sumdiv(m, d, (d%2)* 2^(m/d)*eulerphi(d))/m; \\ Michel Marcus, Aug 18 2018
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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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