OFFSET
1,2
COMMENTS
The last term of the each row r of the triangle is the first term of that row + (tau(r)-1).
As an array, T(n,k) is the index of the k-th term of A027750 whose value is n. - Michel Marcus, Oct 15 2015
LINKS
FORMULA
[seq(nthmember(j, A056534), j=1..105)];
EXAMPLE
As a triangle, sequence begins:
1;
2, 3;
4, 7, 5;
6, 12, 13, 8;
9, 18, 22, 19, 10;
...
As an array, sequence begins:
1, 2, 4, 6, 9, 11, 15, ...
3, 7, 12, 18, 25, 31, 39, ...
5, 13, 22, 32, 43, 55, 68, ...
8, 19, 33, 48, 63, 80, 98, ...
10, 26, 44, 64, 86, 107, 129, ...
...
MAPLE
Maple procedure nthmember given in A054426.
MATHEMATICA
a[n_] := If[p = Position[A056534, n]; p != {}, p[[1, 1]], 0]; (* Jean-François Alcover, Aug 20 2013 *)
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Antti Karttunen, Jun 20 2000
STATUS
approved