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A066646 Arrange the permutations of {1..m} in lexicographic order. Sequence gives indices of permutations of orders 1 or 2. 0

%I #7 Mar 15 2021 01:48:53

%S 1,2,3,6,7,8,15,17,22,24,25,26,27,30,55,56,61,68,81,83,87,95,106,108,

%T 112,120,121,122,123,126,127,128,135,137,142,144,265,266,267,270,289,

%U 290,315,317,340,342,391,392,397,404,415,416,445,451,470,476,513,515

%N Arrange the permutations of {1..m} in lexicographic order. Sequence gives indices of permutations of orders 1 or 2.

%C Independent of choice of m as long as m! exceeds index.

%e Take m=4, say. The first few permutations are 1234, 1243, 1324, 1342, 1423, 1432, 2134, 2143, 2314, ... and numbers 1,2,3,6,7,8,... have orders 1 or 2. This gives the first 6 terms.

%K easy,nice,nonn

%O 1,2

%A _Ian Mooney_, Jan 09 2002

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Last modified May 19 06:35 EDT 2024. Contains 372666 sequences. (Running on oeis4.)