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Search: id:A127076
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| A127076 |
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a(0)=1. a(n) = a(n-1) + (sum of the earlier terms {among terms a(0) through a(n-1)} which are coprime to n). |
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+0
2
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| 1, 2, 3, 6, 10, 22, 23, 90, 117, 175, 319, 746, 1264, 3925, 8313, 10690, 23566, 64525, 133493, 380783, 903835, 2427039, 6349271, 16657466, 24493816, 74970066, 84860988, 133884920, 144156567, 630996725, 637860615, 2396049996, 3819335725
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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EXAMPLE
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The terms of the sequence, among terms a(0) through a(7), which are coprime to 8 are a(0)=1, a(2)=3 and a(6) = 23. So a(8) = a(7) +1 +3 +23 = 117.
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MATHEMATICA
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f[l_List] := Append[l, l[[ -1]] + Plus @@ Select[l, GCD[ #, Length[l]] == 1 &]]; Nest[f, {1}, 32] (*Chandler*)
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CROSSREFS
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Cf. A127075.
Sequence in context: A036650 A049889 A014270 this_sequence A137208 A049527 A074371
Adjacent sequences: A127073 A127074 A127075 this_sequence A127077 A127078 A127079
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet Jan 04 2007
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jan 06 2007
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