A350423 a(n) is the smallest n-gonal number which can be represented as the sum of n distinct nonzero n-gonal numbers in exactly n ways, or -1 if none exists.

190, 289, 330, 561

Offset: 3

Author

Ilya Gutkovskiy, Dec 31 2021

Keywords

• nonn
• more

Examples

			For n = 3: 190 = 1 + 36 + 153 = 15 + 55 + 120 = 21 + 78 + 91.
		

Links

• Eric Weisstein's World of Mathematics, Polygonal Number

Crossrefs

Cf. A057145, A350405.