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Search: id:A126882
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| A126882 |
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a(1)=2. a(n) is the a(n-1)st integer from among those positive integers coprime to a(n-1). |
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2
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| 2, 3, 4, 7, 8, 15, 28, 65, 87, 134, 271, 272, 577, 578, 1227, 1844, 3695, 4624, 9825, 18562, 37127, 37537, 37538, 75627, 113480, 283799, 283800, 1198543, 1201967, 1302144, 3907583, 3907584, 11948189, 13143019, 13151298, 39453911, 46029570
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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FORMULA
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a(n) = A069213(a(n-1)).
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EXAMPLE
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a(4)=7. So a(5) is the 7th positive integer which is coprime to 7. 7 is coprime to 1,2,3,4,5,6,8,9,10,... So a(5) is the 7th of these, which is 8.
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MATHEMATICA
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f[n_] := Block[{k = 0, c = n}, While[c > 0, k++; While[GCD[k, n] > 1, k++ ]; c--; ]; k]; g[l_] := Append[l, f[l[[ -1]]]]; Nest[g, {2}, 36] (*Chandler*)
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CROSSREFS
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Cf. A069213, A126881.
Sequence in context: A092063 A126850 A007497 this_sequence A006549 A159554 A101128
Adjacent sequences: A126879 A126880 A126881 this_sequence A126883 A126884 A126885
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet Dec 29 2006
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 31 2006
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