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A363253
a(n) is the smallest n-gonal number which can be represented as the sum of distinct nonzero n-gonal numbers in exactly n ways, or -1 if no such number exists.
0
OFFSET
3,1
COMMENTS
a(8) = 736, a(9) = 969.
LINKS
Eric Weisstein's World of Mathematics, Polygonal Number
EXAMPLE
For n = 3: 1 + 6 + 21 = 3 + 10 + 15 = 28.
CROSSREFS
KEYWORD
nonn,bref,more,hard
AUTHOR
Ilya Gutkovskiy, May 23 2023
STATUS
approved