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A265347
Transpose of square array A265345.
3
1, 2, 3, 4, 6, 7, 8, 12, 10, 5, 16, 24, 20, 22, 9, 64, 48, 40, 28, 18, 21, 32, 192, 80, 56, 36, 30, 13, 184, 96, 160, 112, 72, 60, 26, 19, 352, 552, 640, 224, 144, 120, 52, 14, 25, 704, 1056, 320, 448, 576, 240, 208, 76, 46, 11, 1408, 2112, 1600, 1720, 288, 480, 104, 136, 68, 58, 15
OFFSET
1,2
COMMENTS
Square array A(row,col) is read by downwards antidiagonals as: A(0,0), A(0,1), A(1,0), A(0,2), A(1,1), A(2,0), A(0,3), A(1,2), A(2,1), A(3,0), ...
All the terms in the same row are either all divisible by 3, or none of them are.
Sequence A265345 is the main entry for this idea, please see further comment there.
EXAMPLE
The top left corner of the array:
1, 2, 4, 8, 16, 64, 32, 184, 352, 704, 1408, ...
3, 6, 12, 24, 48, 192, 96, 552, 1056, 2112, 4224, ...
7, 10, 20, 40, 80, 160, 640, 320, 1600, 3520, 6080, ...
5, 22, 28, 56, 112, 224, 448, 1720, 824, 4936, 9856, ...
9, 18, 36, 72, 144, 576, 288, 1656, 3168, 6336, 12672, ...
21, 30, 60, 120, 240, 480, 1920, 960, 4800, 10560, 18240, ...
13, 26, 52, 208, 104, 520, 1144, 2072, 3712, 16120, 6968, ...
19, 14, 76, 136, 200, 256, 512, 1024, 6040, 3992, 15424, ...
25, 46, 68, 88, 496, 344, 1984, 1376, 5344, 7768, 15224, ...
11, 58, 44, 232, 424, 608, 736, 4384, 2936, 17536, 11744, ...
...
PROG
(Scheme)
(define (A265347 n) (A265345bi (A025581 (+ -1 n)) (A002262 (+ -1 n)))) ;; o=1. Transpose of A265345.
CROSSREFS
Inverse permutation: A265348.
Transpose: A265345.
Sequence in context: A027206 A198034 A016027 * A205591 A191282 A191281
KEYWORD
nonn,tabl,base
AUTHOR
Antti Karttunen, Dec 18 2015
STATUS
approved