A131100 Indices of A002808 such that A081545(m) = Product_{k=m*(m-1)/2+1..m*(m+1)/2} A002808(a(k)).

1, 1, 4, 1, 2, 3, 1, 2, 4, 5, 1, 2, 3, 5, 6, 1, 2, 3, 4, 5, 7, 1, 2, 3, 4, 5, 6, 7, 1, 2, 3, 4, 5, 6, 8, 10, 1, 2, 3, 4, 5, 6, 7, 8, 13, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13

Offset: 1

Author

M. F. Hasler, Jun 14 2007

Keywords

• nonn
• tabl

Examples

			a(2..3) = {1,4} since A081545(2) = A002808(1)*A002808(4) + 1;
a(7..10) = {1,2,4,5} since A081545(4) = A002808(1)*A002808(2)*A002808(4)*A002808(5) + 1.
Triangle begins:
1;
1, 4;
1, 2, 3;
1, 2, 4, 5;
1, 2, 3, 5, 6;
1, 2, 3, 4, 5, 7;
1, 2, 3, 4, 5, 6, 7;
...
		

Links

• Jinyuan Wang, Rows n = 1..100 of triangle, flattened

Crossrefs

Cf. A002808, A081545.

Extensions

Offset changed to 1 by and more terms from Jinyuan Wang, Dec 04 2020