A323476 Positions of 3's in A306211.

37, 52, 58, 76, 82, 91, 115, 121, 130, 145, 177, 183, 192, 207, 230, 257, 275, 281, 290, 305, 328, 355, 364, 391, 404, 410, 416, 431, 437, 446, 461, 484, 511, 520, 547, 560, 566, 572, 578, 605, 618, 624, 630, 640, 646, 654, 678, 684, 693, 708, 731, 758, 767

Offset: 1

Author

N. J. A. Sloane, Jan 29 2019

Keywords

• nonn

Links

• Rémy Sigrist, Table of n, a(n) for n = 1..25000
• Rémy Sigrist, C program for A323476

Crossrefs

Cf. A306211, A306222, A306223.

Programs

C

See Links section.

Mathematica

seq[n_] := seq[n] = If[n==1, {1}, Join[seq[n-1], Length /@ Split[seq[n-1]]] ];
Position[seq[26], 3] // Flatten (* Jean-François Alcover, Jul 19 2022 *)