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 column are either all divisible by 3, or none of them are.
LINKS
FORMULA
EXAMPLE
The top left corner of the array:
1, 3, 7, 5, 9, 21, 13, 19, 25, 11, 15, 39, .
2, 6, 10, 22, 18, 30, 26, 14, 46, 58, 66, 78, .
4, 12, 20, 28, 36, 60, 52, 76, 68, 44, 84, 156, .
8, 24, 40, 56, 72, 120, 208, 136, 88, 232, 168, 624, .
16, 48, 80, 112, 144, 240, 104, 200, 496, 424, 336, 312, .
64, 192, 160, 224, 576, 480, 520, 256, 344, 608, 672, 1560, .
32, 96, 640, 448, 288, 1920, 1144, 512, 1984, 736, 1344, 3432, .
184, 552, 320, 1720, 1656, 960, 2072, 1024, 1376, 4384, 5160, 6216, .
352, 1056, 1600, 824, 3168, 4800, 3712, 6040, 5344, 2936, 2472, 11136, .
...
PROG
CROSSREFS
KEYWORD
AUTHOR
Antti Karttunen, Dec 18 2015
STATUS
approved