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

1,6

Links

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

Example

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,
...

Crossrefs

Cf. A121153, A170943, A170944, A170951.

Sequence in context: A096088 A107681 A021298 * A194587 A175646 A324362

Adjacent sequences: A170949 A170950 A170951 * A170953 A170954 A170955

Keyword

nonn,tabf

Author

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

Status

approved