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A138881 Array read by rows: row n lists divisors of n-th positive triangular number A000217(n). 1
1, 1, 3, 1, 2, 3, 6, 1, 2, 5, 10, 1, 3, 5, 15, 1, 3, 7, 21, 1, 2, 4, 7, 14, 28, 1, 2, 3, 4, 6, 9, 12, 18, 36, 1, 3, 5, 9, 15, 45, 1, 5, 11, 55, 1, 2, 3, 6, 11, 22, 33, 66, 1, 2, 3, 6, 13, 26, 39, 78, 1, 7, 13, 91, 1, 3, 5, 7, 15, 21, 35, 105 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..72.

EXAMPLE

Array begins:

1

1, 3

1, 2, 3, 6

1, 2, 5, 10

1, 3, 5, 15

1, 3, 7, 21

1, 2, 4, 7, 14, 28

CROSSREFS

Cf. A000217, A133021, A133031, A138882.

Sequence in context: A107341 A209849 A245547 * A070983 A078350 A078719

Adjacent sequences:  A138878 A138879 A138880 * A138882 A138883 A138884

KEYWORD

easy,nonn,tabf

AUTHOR

Omar E. Pol, Apr 11 2008

STATUS

approved

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Last modified May 31 22:29 EDT 2020. Contains 334756 sequences. (Running on oeis4.)