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A277680 Inverse of the permutation A277679 of the natural numbers. 2
1, 3, 2, 5, 6, 8, 4, 10, 9, 12, 13, 19, 7, 14, 15, 17, 11, 21, 18, 25, 26, 32, 16, 27, 20, 23, 24, 34, 33, 40, 28, 30, 22, 36, 35, 38, 41, 51, 31, 42, 43, 49, 39, 53, 50, 61, 62, 72, 29, 44, 45, 47, 37, 55, 48, 63, 64, 70, 46, 65, 52, 59, 60, 74, 73, 84, 54 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

This is a permutation of the natural numbers, with inverse permutation A277679.

LINKS

Clark Kimberling, Table of n, a(n) for n = 1..10000

Index entries for sequences that are permutations of the natural numbers

MATHEMATICA

x = Range[500];

NestWhile[# + 1 &, 1, (t = 1/2 # (1 + #);

x = Flatten[{Take[x, t],

Map[Reverse, Partition[Drop[x, t], # + 1]]}];

Length[x] > t) &]; x (* A277679 *)

Take[Ordering[#], Position[Differences[Sort[#]], Except[1]][[2]][[1]]]&[x] (* A277680 *) (* Peter J. C. Moses, Nov 13 2016 *)

CROSSREFS

Cf. A000027, A277679, A007062, A057030.

Sequence in context: A083236 A302717 A277820 * A303764 A079973 A267150

Adjacent sequences:  A277677 A277678 A277679 * A277681 A277682 A277683

KEYWORD

nonn,look,easy

AUTHOR

Clark Kimberling, Nov 14 2016

STATUS

approved

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Last modified June 25 22:27 EDT 2019. Contains 324364 sequences. (Running on oeis4.)