OFFSET
1,25
EXAMPLE
The triangle starts at row n=1 with columns k = 1..n:
0;
0,1;
0,0,0;
0,1,1,1;
0,0,0,0,0;
0,0,0,0,0,0;
0,0,0,2,0,0,0;
0,1,1,0,1,3,1,3;
0,1,1,1,1,1,1,1,1;
0,0,0,0,0,2,0,2,0,2;
0,0,0,0,0,0,0,0,0,0,0;
MATHEMATICA
Array[Mod[DivisorSigma[1, #], DivisorSigma[0, Range[#]]] &, 15] (* Paolo Xausa, Jun 28 2024 *)
CROSSREFS
KEYWORD
AUTHOR
Juri-Stepan Gerasimov, Dec 02 2010
STATUS
approved