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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.
2
190, 289, 330, 561
OFFSET
3,1
LINKS
Eric Weisstein's World of Mathematics, Polygonal Number
EXAMPLE
For n = 3: 190 = 1 + 36 + 153 = 15 + 55 + 120 = 21 + 78 + 91.
CROSSREFS
Sequence in context: A260762 A218292 A333834 * A051979 A097647 A248995
KEYWORD
nonn,more
AUTHOR
Ilya Gutkovskiy, Dec 31 2021
STATUS
approved