A169896 Irregular triangle read by rows in which row n (n>=1) lists distinct carryless divisors i of in range 1 <= i <= n.

1, 1, 2, 1, 3, 1, 2, 4, 1, 3, 5, 5, 5, 1, 2, 3, 4, 6, 6, 1, 7, 1, 2, 3, 4, 4, 6, 6, 7, 8, 8, 1, 3, 7, 9, 1, 10, 1, 11, 1, 12, 1, 13, 1, 14, 1, 15, 1, 16, 1, 17, 1, 18, 1, 19, 1, 2, 2, 6, 10, 15, 20, 20, 1, 21, 1, 2, 2, 6, 11, 16, 22, 22, 1, 23, 1, 2, 2, 6, 12, 17, 24, 24, 1, 25, 1, 2, 2, 6, 6, 13, 18

Offset

1,3

Links

Table of n, a(n) for n=1..92.

Index entries for sequences related to carryless arithmetic

Example

Triangle begins:
1,
1, 2,
1, 3,
1, 2, 4,
1, 3, 5,
1, 2, 3, 4, 6,
1, 7,
1, 2, 3, 4, 6, 7, 8,
1, 3, 7, 9,
1, 10,
1, 11,
1, 12,
1, 13,
1, 14,
1, 15,
1, 16,
1, 17,
1, 18,
1, 19,
1, 2, 6, 10, 15, 20,
1, 21,
1, 2, 6, 11, 16, 22,
...

Crossrefs

Sequence in context: A368313 A346795 A361172 * A210208 A162306 A348135

Adjacent sequences: A169893 A169894 A169895 * A169897 A169898 A169899

Keyword

nonn,tabf,base

Author

David Applegate, Marc LeBrun and N. J. A. Sloane, Jul 11 2010

Status

approved