A360218 a(n) is the smallest positive integer which can be represented as the sum of n distinct nonzero square pyramidal numbers in exactly n ways, or -1 if no such integer exists.

1, 5580, 2814, 1980, 1595, 1700, 2175, 2415, 2830, 3740, 4810, 5995, 7610, 9240, 11380, 13896, 16506, 19735, 23150, 27441, 32085, 36721, 42755, 49570, 56610, 65135, 73165, 83021, 93835, 105671, 118255, 132545, 147546, 163516, 182155, 201040, 222371, 244280, 267856

Offset: 1

Author

Ilya Gutkovskiy, Jan 30 2023

Keywords

• nonn

Examples

			For n = 3: 2814 = 14 + 1015 + 1785 = 55 + 650 + 2109 = 140 + 204 + 2470.
		

Links

• Michael S. Branicky, Table of n, a(n) for n = 1..80
• Eric Weisstein's World of Mathematics, Square Pyramidal Number

Crossrefs

Cf. A000330, A350206, A350241, A350397, A360217.

Extensions

a(18)-a(33) from Michael S. Branicky, Feb 04 2023

a(34) and beyond from Michael S. Branicky, Feb 18 2023