a(n) is the smallest n-gonal pyramidal number greater than 1 which is also n-gonal; a(n) = 0 when one does not exist.

A308488

a(n) is the smallest n-gonal pyramidal number greater than 1 which is also n-gonal; a(n) = 0 when one does not exist.

Terms

    a(0) =10a(1) =4900a(2) =0a(3) =946a(4) =0a(5) =1045a(6) =0a(7) =175a(8) =23725a(9) =0a(10) =0a(11) =441a(12) =0a(13) =0a(14) =975061a(15) =0a(16) =0a(17) =3578401a(18) =0a(19) =0a(20) =10680265a(21) =0a(22) =0a(23) =27453385a(24) =0a(25) =0a(26) =63016921a(27) =23001a(28) =0a(29) =132361021

External references