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A254679 Table read by rows: row n lists the divisors of n, ordered lexicographically in decimal representation. 2
1, 1, 2, 1, 3, 1, 2, 4, 1, 5, 1, 2, 3, 6, 1, 7, 1, 2, 4, 8, 1, 3, 9, 1, 10, 2, 5, 1, 11, 1, 12, 2, 3, 4, 6, 1, 13, 1, 14, 2, 7, 1, 15, 3, 5, 1, 16, 2, 4, 8, 1, 17, 1, 18, 2, 3, 6, 9, 1, 19, 1, 10, 2, 20, 4, 5, 1, 21, 3, 7, 1, 11, 2, 22, 1, 23, 1, 12, 2, 24 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Reinhard Zumkeller, Rows n = 1..1000 of triangle, flattened

EXAMPLE

.    n | T(n,1..A000005(n))       n | T(n,1..A000005(n))

.  ----+-------------------     ----+-------------------

.    1 | 1                       21 | 1 21 3 7

.    2 | 1 2                     22 | 1 11 2 22

.    3 | 1 3                     23 | 1 23

.    4 | 1 2 4                   24 | 1 12 2 24 3 4 6 8

.    5 | 1 5                     25 | 1 25 5

.    6 | 1 2 3 6                 26 | 1 13 2 26

.    7 | 1 7                     27 | 1 27 3 9

.    8 | 1 2 4 8                 28 | 1 14 2 28 4 7

.    9 | 1 3 9                   29 | 1 29

.   10 | 1 10 2 5                30 | 1 10 15 2 3 30 5 6

.   11 | 1 11                    31 | 1 31

.   12 | 1 12 2 3 4 6            32 | 1 16 2 32 4 8

.   13 | 1 13                    33 | 1 11 3 33

.   14 | 1 14 2 7                34 | 1 17 2 34

.   15 | 1 15 3 5                35 | 1 35 5 7

.   16 | 1 16 2 4 8              36 | 1 12 18 2 3 36 4 6 9

.   17 | 1 17                    37 | 1 37

.   18 | 1 18 2 3 6 9            38 | 1 19 2 38

.   19 | 1 19                    39 | 1 13 3 39

.   20 | 1 10 2 20 4 5           40 | 1 10 2 20 4 40 5 8 .

PROG

(Haskell)

import Data.List (sortBy); import Data.Ord (comparing)

a254679 n k = a254679_tabf !! (n-1) !! (k-1)

a254679_row n = a254679_tabf !! (n-1)

a254679_tabf = map (sortBy (comparing show)) a027750_tabf

CROSSREFS

Cf. A027750, A000005 (row lengths), a000203 (row sums), a122425 (right edge).

Sequence in context: A233773 A027750 A275055 * A275280 A087295 A175344

Adjacent sequences:  A254676 A254677 A254678 * A254680 A254681 A254682

KEYWORD

nonn,base,tabf

AUTHOR

Reinhard Zumkeller, Feb 05 2015

STATUS

approved

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Last modified February 23 21:06 EST 2018. Contains 299587 sequences. (Running on oeis4.)