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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.
2
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
1,3
COMMENTS
Is the first column the all 1's sequence?
EXAMPLE
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.
Sequence in context: A193588 A165884 A263939 * A136311 A243884 A366624
KEYWORD
nonn,tabl
AUTHOR
Peter Kagey, Sep 03 2021
STATUS
approved