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

A352975

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

Terms

    a(0) =96a(1) =192a(2) =330a(3) =504a(4) =840a(5) =1304a(6) =1872a(7) =2910a(8) =3971a(9) =5340a(10) =6851a(11) =8932a(12) =11700a(13) =14496a(14) =18258a(15) =22410a(16) =27265a(17) =32620a(18) =39606a(19) =47124a(20) =55545a(21) =65448a(22) =76050a(23) =87854a(24) =101925a(25) =116956a(26) =134125a(27) =152340a(28) =173538a(29) =195424

External references