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A374144
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a(n) is the smallest number which can be represented as the sum of two distinct nonzero n-gonal numbers in exactly n ways, or -1 if no such number exists.
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3
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81, 1105, 205427, 483031, 9402323, 6232341, 79324200, 768459127, 2265692766, 2413112833, 6737406626, 150437989675, 45319359337, 15140186701
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OFFSET
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3,1
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LINKS
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EXAMPLE
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a(3) = 81 = 3 + 78 = 15 + 66 = 36 + 45.
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PROG
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(Python) # see linked program
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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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EXTENSIONS
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STATUS
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approved
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