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A368075
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a(n) is the least n-gonal number that can be expressed as the difference of two positive n-gonal numbers in exactly n ways.
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1
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OFFSET
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3,1
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COMMENTS
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The corresponding indices of n-gonal numbers are in A368074.
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LINKS
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EXAMPLE
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a(3) = 15: 15 = 21 - 6 = 36 - 21 = 120 - 105.
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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