A170952 Take the Cantor set sequence A121153 and if the entry m = A121153(n) is in the range 3^k <= m < 3^(k+1), subtract 3^k from it.

0, 0, 1, 0, 1, 3, 4, 0, 1, 3, 9, 12, 13, 0, 1, 3, 9, 10, 27, 36, 39, 40, 0, 1, 3, 9, 27, 30, 81, 85, 108, 117, 120, 121, 0, 1, 3, 9, 27, 28, 81, 90, 91, 220, 243, 255, 307, 324, 351, 360, 363, 364, 0, 1, 3, 9, 27, 81, 84, 175, 243, 270, 273, 625, 660, 729, 733, 765, 921, 972, 1053

Offset: 1

Author

J. H. Conway, T. D. Noe and N. J. A. Sloane, Feb 22 2010

Keywords

• nonn
• tabf

Examples

			If written as a triangle:
0,
0, 1,
0, 1, 3, 4,
0, 1, 3, 9, 12, 13,
0, 1, 3, 9, 10, 27, 36, 39, 40,
0, 1, 3, 9, 27, 30, 81, 85, 108, 117, 120, 121,
0, 1, 3, 9, 27, 28, 81, 90, 91, 220, 243, 255, 307, 324, 351, 360, 363, 364,
0, 1, 3, 9, 27, 81, 84, 175, 243, 270, 273, 625, 660, 729, 733, 765, 921, 972, 1053, 1080, 1089, 1092, 1093,
...
		

Links

• N. J. A. Sloane, Table of n, a(n) for n=1..179

Crossrefs

Cf. A121153, A170943, A170944, A170951.