A131100 - OEIS

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

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OFFSET

1,3

LINKS

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

EXAMPLE

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, 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;

...

CROSSREFS

Cf. A002808, A081545.

Sequence in context: A222213 A010473 A176041 * A321091 A375576 A064124

Adjacent sequences: A131097 A131098 A131099 * A131101 A131102 A131103

KEYWORD

nonn,tabl

AUTHOR

M. F. Hasler, Jun 14 2007

EXTENSIONS

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

STATUS

approved