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A350397
a(n) is the smallest number which can be represented as the sum of n distinct nonzero n-gonal pyramidal numbers in exactly n ways, or -1 if no such number exists.
6
305, 1980, 1900, 3321, 5256, 8310, 12516, 17108, 24832, 34249, 42381, 61697, 78766, 106956, 132994, 170325, 203415, 266595, 322943, 393828, 475520, 569416, 695799, 823447, 958300, 1149125, 1313545, 1565055, 1802736, 2088119, 2376250, 2748270, 3135195, 3548876
OFFSET
3,1
LINKS
Eric Weisstein's World of Mathematics, Pyramidal Number
EXAMPLE
For n = 3: 305 = 1 + 84 + 220 = 20 + 120 + 165 = 56 + 84 + 165.
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Dec 29 2021
EXTENSIONS
a(10)-a(22) from Michael S. Branicky, Dec 29 2021
a(23)-a(36) from Martin Ehrenstein, Jan 14 2022
STATUS
approved