A347499 Triangle read by rows: n-th row is the lexicographically earliest n-element subset of {1,2,3,...,A347498(n)} with the property that all products i * j are distinct for i <= j.

1, 1, 2, 1, 2, 3, 1, 2, 3, 5, 1, 3, 4, 5, 6, 1, 3, 4, 5, 6, 7, 1, 2, 5, 6, 7, 8, 9, 1, 2, 5, 6, 7, 8, 9, 11, 1, 2, 5, 6, 7, 8, 9, 11, 13, 1, 2, 5, 7, 8, 9, 11, 12, 13, 15, 1, 2, 5, 7, 8, 9, 11, 12, 13, 15, 17, 1, 2, 5, 7, 8, 9, 11, 12, 13, 15, 17, 19

Offset: 1

Author

Peter Kagey, Sep 03 2021

Keywords

• nonn
• tabl

Comments

Is the first column the all 1's sequence?

Examples

			Triangle begins:
  1;
  1,  2;
  1,  2,  3;
  1,  2,  3,  5;
  1,  3,  4,  5,  6;
  1,  3,  4,  5,  6,  7;
  1,  2,  5,  6,  7,  8,  9;
  1,  2,  5,  6,  7,  8,  9, 11;
  1,  2,  5,  6,  7,  8,  9, 11, 13;
  1,  2,  5,  7,  8,  9, 11, 12, 13, 15;
  1,  2,  5,  7,  8,  9, 11, 12, 13, 15, 17;
  1,  2,  5,  7,  8,  9, 11, 12, 13, 15, 17, 19;
  1,  5,  6,  7,  9, 11, 13, 14, 15, 16, 17, 19, 20;
  1,  2,  5,  7, 11, 12, 13, 16, 17, 18, 19, 20, 21, 23;
  ...
		

Crossrefs

A106683 is analogous for addition.

Cf. A347498.