A360836 a(n) is the least n-gonal pyramidal number that is the sum of two or more consecutive nonzero n-gonal pyramidal numbers in more than one way.

12880, 18896570

Offset: 2

Author

Ilya Gutkovskiy, Feb 23 2023

Keywords

• nonn
• bref
• more

Comments

a(4) > 10^19 if it exists. - Michael S. Branicky, Feb 23 2023

Examples

			For n = 2: 12880 = 91 + ... + 903 = 300 + ... + 990.
For n = 3: 18896570 = 708561 + ... + 1021384 = 2604125 + ... + 2796160.
		

Links

• Eric Weisstein's World of Mathematics, Pyramidal Number

Crossrefs

Cf. A080851, A360762.