OFFSET
1,2
COMMENTS
If n is an odd prime p then row n has length (p + 1)/2 and all terms in row n are 2's.
For more information about the diagram of the symmetric representation of sigma(n) see A237593 and other related sequences.
EXAMPLE
Triangle begins:
1;
2, 1;
2, 2;
2, 3, 2;
2, 2, 2;
2, 3, 4, 3;
2, 2, 2, 2;
2, 2, 4, 5, 2;
2, 2, 2, 4, 3;
2, 2, 2, 4, 6, 2;
2, 2, 2, 2, 2, 2;
2, 2, 2, 5, 6, 7, 4;
2, 2, 2, 2, 2, 2, 2;
2, 2, 2, 2, 4, 6, 4, 2;
2, 2, 2, 2, 3, 6, 5, 2;
2, 2, 2, 2, 2, 4, 8, 7, 2;
2, 2, 2, 2, 2, 2, 2, 2, 2;
2, 2, 2, 2, 2, 4, 8, 9, 6, 2;
2, 2, 2, 2, 2, 2, 2, 2, 2, 2;
...
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Omar E. Pol, Feb 22 2018
STATUS
approved