A093812 - cp's OEIS frontend

A093812 a(1) = 1; for n > 1, a(n) is the smallest positive integer not already used such that a(n)*a(n-1) + 1 is a fourth power.

n	a(n)
1	1
2	15
3	17
4	1680
5	421
6	56086995
7	9940915081637
8	31271643639794562523698024915
9	3090319883395626207270178075850946683940891639487741952
10	9721376888636052447184767296534734059409700304429485542107645657085305

[1, 15, 17, 1680, 421, 56086995, 9940915081637, 31271643639794562523698024915, 3090319883395626207270178075850946683940891639487741952, 9721376888636052447184767296534734059409700304429485542107645657085305]

cp's OEIS Frontend

A093812 a(1) = 1; for n > 1, a(n) is the smallest positive integer not already used such that a(n)*a(n-1) + 1 is a fourth power.

Table of values

List of values