OFFSET
2,4
COMMENTS
Row n starts with 0 and ends with n-1.
Row n of this irregular array can be viewed as the first row of an infinite matrix with elements a_{j,i} = T(n,i)+n*j. That matrix consists of all nonnegative integers i such that n divides i(i+1).
I use these matrices to generate subsequences of A012132, as you may see on page 9 of my referenced work.
LINKS
EXAMPLE
Row 12 is 0,3,8,11 which is the first row of the matrix:
0 3 8 11
12 15 20 23
24 27 32 35
...
giving all nonnegative integers i such that 12 divides i(i+1) (cf. A108752).
Array begins:
0, 1;
0, 2;
0, 3;
0, 4;
0, 2, 3, 5;
0, 6;
0, 7;
0, 8;
0, 4, 5, 9;
...
PROG
(Python)
[i for n in range(2, 30) for i in range(0, n) if i*(i+1)%n==0] # Andrey Zabolotskiy, Mar 19 2022
CROSSREFS
KEYWORD
nonn,easy,tabf
AUTHOR
Robert Phillips (bobp(AT)usca.edu), Jun 24 2005
EXTENSIONS
Edited by Andrey Zabolotskiy, Mar 19 2022
STATUS
approved