A352015 Square array read by antidiagonals upwards: T(n,k) is the n-th number m such that the symmetric representation of sigma(m) has at least one subpart k, with n >= 1, k >= 1, m >= 1.

1, 6, 3, 15, 18, 2, 28, 45, 5, 7, 45

Offset

1,2

Links

Table of n, a(n) for n=1..11.

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

Row 1 gives A351904.

Column 1 gives A000384.

Cf. A000203, A001227 (number of subparts), A196020, A235791, A236104, A237270, A237271, A237591, A237593, A279387 (definition of subparts), A280850, A280851 (subparts), A296508, A346875, A347529, A351819.

Sequence in context: A116570 A335567 A362625 * A225503 A302350 A046879

Adjacent sequences: A352012 A352013 A352014 * A352016 A352017 A352018

Keyword

nonn,tabl,more

Author

Omar E. Pol, Feb 28 2022

Status

approved