A351291 Numbers k such that the k-th composition in standard order does not have all distinct runs.

13, 22, 25, 45, 46, 49, 53, 54, 59, 76, 77, 82, 89, 91, 93, 94, 97, 101, 102, 105, 108, 109, 110, 115, 118, 141, 148, 150, 153, 156, 162, 165, 166, 173, 177, 178, 180, 181, 182, 183, 187, 189, 190, 193, 197, 198, 201, 204, 205, 209, 210, 213, 214, 216, 217

Offset

1,1

Comments

The n-th composition in standard order (graded reverse-lexicographic, A066099) is obtained by taking the set of positions of 1's in the reversed binary expansion of n, prepending 0, taking first differences, and reversing again. This gives a bijective correspondence between nonnegative integers and integer compositions.

Links

Table of n, a(n) for n=1..55.

Mathematics Stack Exchange, What is a sequence run? (answered 2011-12-01)

Example

The terms together with their binary expansions and corresponding compositions begin:
  13:     1101  (1,2,1)
  22:    10110  (2,1,2)
  25:    11001  (1,3,1)
  45:   101101  (2,1,2,1)
  46:   101110  (2,1,1,2)
  49:   110001  (1,4,1)
  53:   110101  (1,2,2,1)
  54:   110110  (1,2,1,2)
  59:   111011  (1,1,2,1,1)
  76:  1001100  (3,1,3)
  77:  1001101  (3,1,2,1)
  82:  1010010  (2,3,2)
  89:  1011001  (2,1,3,1)
  91:  1011011  (2,1,2,1,1)
  93:  1011101  (2,1,1,2,1)
  94:  1011110  (2,1,1,1,2)

Mathematica

stc[n_]:=Differences[Prepend[Join@@ Position[Reverse[IntegerDigits[n, 2]], 1], 0]]//Reverse;
Select[Range[0, 100], !UnsameQ@@Split[stc[#]]&]

Crossrefs

The version for Heinz numbers of partitions is A130092, complement A130091.

Normal multisets with a permutation of this type appear to be A283353.

Partitions w/o permutations of this type are A351204, complement A351203.

The version using binary expansions is A351205, complement A175413.

The complement is A351290, counted by A351013.

A005811 counts runs in binary expansion, distinct A297770.

A011782 counts integer compositions.

A044813 lists numbers whose binary expansion has all distinct run-lengths.

A085207 represents concatenation of standard compositions, reverse A085208.

A333489 ranks anti-runs, complement A348612, counted by A003242.

A345167 ranks alternating compositions, counted by A025047.

Counting words with all distinct runs:

- A351016 = binary words, for run-lengths A351017.

- A351018 = binary expansions, for run-lengths A032020.

- A351200 = patterns, for run-lengths A351292.

- A351202 = permutations of prime factors.

Selected statistics of standard compositions (A066099, reverse A228351):

- Length is A000120.

- Sum is A070939.

- Runs are counted by A124767, distinct A351014.

- Heinz number is A333219.

- Number of distinct parts is A334028.

Selected classes of standard compositions:

- Partitions are A114994, strict A333256.

- Multisets are A225620, strict A333255.

- Strict compositions are A233564.

- Constant compositions are A272919.

Cf. A098859, A106356, A113835, A116608, A238279, A242882, A318928, A325545, A328592, A329745, A350952, A351015, A351201.

Sequence in context: A158998 A122559 A132131 * A336263 A059408 A164455

Adjacent sequences: A351288 A351289 A351290 * A351292 A351293 A351294

Keyword

nonn

Author

Gus Wiseman, Feb 12 2022

Status

approved