A173800 Irregular triangle in which row n has primitive numbers k such that 1/k is in the Cantor set and the fraction 1/k has period n.

1, 4, 13, 10, 40, 121, 28, 91, 364, 1093, 82, 328, 820, 3280, 757, 9841, 244, 7381, 29524, 88573, 730, 949, 2920, 6643, 9490, 20440, 26572, 66430, 265720, 797161, 2188, 597871, 2391484, 59293, 551881, 7174453, 6562, 26248, 65620, 253216

Offset: 1

Author

T. D. Noe, Feb 25 2010

Keywords

• nonn
• tabf

Comments

This sequence is a permutation of A173793. Row n ends with (3^n-1)/2. The length of row n is A173801(n).

Links

• T. D. Noe, Rows n=1..200, flattened