10000-gonal numbers: a(n) = n + 4999 * n * (n-1).

Terms

a(0) =0a(1) =1a(2) =10000a(3) =29997a(4) =59992a(5) =99985a(6) =149976a(7) =209965a(8) =279952a(9) =359937a(10) =449920a(11) =549901a(12) =659880a(13) =779857a(14) =909832a(15) =1049805a(16) =1199776a(17) =1359745a(18) =1529712a(19) =1709677a(20) =1899640a(21) =2099601a(22) =2309560a(23) =2529517a(24) =2759472a(25) =2999425a(26) =3249376a(27) =3509325a(28) =3779272a(29) =4059217