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A217438 Triangle with the chains described in A217287. 7
1, 2, 3, 2, 3, 3, 4, 5, 4, 5, 6, 7, 5, 6, 7, 6, 7, 7, 8, 9, 10, 11, 8, 9, 10, 11, 9, 10, 11, 10, 11, 12, 13, 14, 11, 12, 13, 14, 15, 12, 13, 14, 15, 13, 14, 15, 14, 15, 15, 16, 17, 16, 17, 18, 19, 20, 21, 22, 23, 17, 18, 19, 20, 21, 22, 23, 18, 19, 20, 21, 22, 23, 19, 20, 21, 22, 23, 20, 21, 22, 23, 21, 22, 23 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The length of row n is A217287(n).

LINKS

Michael De Vlieger, Table of n, a(n) for n = 1..10441 (rows 1 <= n <= 1024, flattened)

Michael De Vlieger, Plot (n, m) where m is a term in row n of this sequence, for rows 1 <= n <= 1024.

EXAMPLE

These are the first chains of the triangle:

1, 2, 3;

   2, 3;

      3, 4, 5;

         4, 5, 6, 7;

            5, 6, 7;

               6, 7;

                  7, 8, 9, 10, 11;

                     8, 9, 10, 11;

                        9, 10, 11;

                           10, 11, 12, 13, 14;

                               ...

MATHEMATICA

Block[{nn = 24, r}, r = Array[If[# == 1, 0, Total[2^(PrimePi /@ FactorInteger[#][[All, 1]] - 1)]] &, nn + Ceiling@ Sqrt@ nn]; Array[Block[{k = # + 1, s = r[[#]]}, While[UnsameQ[s, Set[s, BitOr[s, r[[k]] ] ] ], k++]; Range[#, k - 1]] &, nn] ] // Flatten (* Michael De Vlieger, May 02 2020 *)

CROSSREFS

Cf. A217287, A217288, A217289.

Sequence in context: A205146 A031248 A030582 * A036762 A032154 A300651

Adjacent sequences:  A217435 A217436 A217437 * A217439 A217440 A217441

KEYWORD

nonn,tabf

AUTHOR

Lior Manor, Oct 03 2012

EXTENSIONS

Row 1 prepended to match A217287 and edited by Michael De Vlieger, May 02 2020.

STATUS

approved

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Last modified June 22 03:25 EDT 2021. Contains 345367 sequences. (Running on oeis4.)