OFFSET
1,2
EXAMPLE
The corner of the square array looks like this:
1, 3, 2, 7, ...
6, 18, 5, ...
15, 45, ...
28, ...
...
For n = 3 and k = 2 we have that 45 is the third positive integer m whose symmetric representation of sigma(m) has at least one subpart 2, so T(3,2) = 45.
For n = 5 and k = 1 we have that 45 is also the fifth positive integer m whose symmetric representation of sigma(m) has at least one subpart 1, so T(5,1) = 45.
CROSSREFS
KEYWORD
AUTHOR
Omar E. Pol, Feb 28 2022
STATUS
approved