Conjectured largest number that is not the sum of three n-gonal numbers, or -1 if there is no largest number.

A118278

Conjectured largest number that is not the sum of three n-gonal numbers, or -1 if there is no largest number.

Terms

    a(0) =0a(1) =-1a(2) =33066a(3) =146858a(4) =273118a(5) =-1a(6) =1274522a(7) =2117145a(8) =3613278a(9) =-1a(10) =7250758a(11) =-1a(12) =12911636a(13) =-1a(14) =22655394a(15) =26801303a(16) =25049533a(17) =-1a(18) =56922533a(19) =115715602a(20) =81539010a(21) =-1a(22) =85105105a(23) =-1a(24) =106555658a(25) =-1a(26) =233296317a(27) =267370631a(28) =286763923a(29) =-1

External references