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Search: id:A101369
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| A101369 |
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a(2n-1) = the smallest positive integer not occurring earlier in the sequence. a(2n) = the a(2n-1)th smallest positive integer among those not occurring earlier in the sequence. |
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+0
2
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| 1, 2, 3, 6, 4, 9, 5, 12, 7, 16, 8, 19, 10, 23, 11, 26, 13, 30, 14, 33, 15, 36, 17, 40, 18, 43, 20, 47, 21, 50, 22, 53, 24, 57, 25, 60, 27, 64, 28, 67, 29, 70, 31, 74, 32, 77, 34, 81, 35, 84, 37, 88, 38, 91, 39, 94, 41, 98, 42, 101, 44, 105, 45, 108, 46, 111, 48, 115, 49, 118
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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A permutation of the positive integers.
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FORMULA
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a(n)<a(n+2). - Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 11 2005
For n>0, a(2n-1)=1+floor((2n-1)/sqrt(2)) and a(2n)=2n+floor((2n)/sqrt(2)-1/sqrt(2)) - Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 22 2005
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MATHEMATICA
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lst = Range[150]; a[n_] := a[n] = If[ OddQ[n], b = First[lst]; lst = Rest[lst]; b, b = lst[[ a[n - 1]]]; lst = Drop[lst, {a[n - 1]}]; b]; Table[ a[n], {n, 70}]
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CROSSREFS
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Sequence in context: A059900 A123664 A084980 this_sequence A125147 A103864 A073318
Adjacent sequences: A101366 A101367 A101368 this_sequence A101370 A101371 A101372
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KEYWORD
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nonn,nice
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AUTHOR
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Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Jan 13 2005
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 11 2005
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