A309734 Inverse permutation to A309668.

1, 2, 5, 4, 3, 10, 9, 8, 7, 6, 11, 20, 19, 18, 17, 16, 15, 14, 13, 25, 12, 23, 22, 21, 40, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 53, 26, 50, 49, 24, 47, 46, 45, 44, 43, 42, 41, 81, 79, 39, 76, 75, 74, 72, 71, 70, 69, 68, 67, 66, 65, 64, 63, 62, 61

Offset

1,2

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Index entries for sequences that are permutations of the natural numbers

Example

A309668(5) = 3, hence a(3) = 5.

Maple

S:= [$1..100]:
for n from 1 while S <> [] do
  for i from 1 to nops(S) do
    s:= S[i];
    if ilog2(n*s+n-1) > ilog2(n*s-1) then
      A[s]:= n;
      S:= subsop(i=NULL, S);
      break
    fi
od od:
seq(A[i], i=1..100); # Robert Israel, Apr 23 2020

Crossrefs

Cf. A309668.

Sequence in context: A266415 A132664 A072029 * A309668 A238758 A354182

Adjacent sequences: A309731 A309732 A309733 * A309735 A309736 A309737

Keyword

nonn,base,look

Author

Rémy Sigrist, Aug 14 2019

Status

approved