a(n) is the smallest number which can be represented as the sum of three distinct nonzero n-gonal numbers in exactly n ways, or -1 if no such number exists.

A374273

a(n) is the smallest number which can be represented as the sum of three distinct nonzero n-gonal numbers in exactly n ways, or -1 if no such number exists.

Terms

    a(0) =37a(1) =161a(2) =498a(3) =1666a(4) =2546a(5) =7434a(6) =16609a(7) =25952a(8) =48786a(9) =49861a(10) =72347a(11) =127335a(12) =183289a(13) =196469a(14) =416913a(15) =466546a(16) =494369a(17) =506649a(18) =801010a(19) =1401011a(20) =2372586a(21) =1414009a(22) =2003027a(23) =3274986a(24) =2927260a(25) =2721677a(26) =5592756a(27) =8016592a(28) =6632759a(29) =7057914

External references