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

Author

Ilya Gutkovskiy, Dec 10 2023

Keywords

• nonn
• hard
• more

Comments

Index of first occurrence of n in A368072.

Examples

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

Links

• Eric Weisstein's World of Mathematics, Tetrahedral Number

Crossrefs

Cf. A000292, A136108, A334007, A368072.