A169896 - OEIS

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

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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, 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 A376248

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