A368076 a(n) is the least integer that can be expressed as the difference of two positive tetrahedral numbers in exactly n ways.

3, 36, 2180, 10053736

Offset

1,1

Comments

Index of first occurrence of n in A368072.

Links

Table of n, a(n) for n=1..4.

Eric Weisstein's World of Mathematics, Tetrahedral Number

Example

a(2) = 36: 36 = 56 - 20 = 120 - 84.

Crossrefs

Cf. A000292, A136108, A334007, A368072.

Sequence in context: A193302 A289315 A102579 * A136393 A168370 A325907

Adjacent sequences: A368073 A368074 A368075 * A368077 A368078 A368079

Keyword

nonn,hard,more

Author

Ilya Gutkovskiy, Dec 10 2023

Status

approved