The index of the least triangular number greater than 1 that is also an n-gonal number, or 0 if none exists.

A188893

The index of the least triangular number greater than 1 that is also an n-gonal number, or 0 if none exists.

Terms

    a(0) =2a(1) =8a(2) =20a(3) =3a(4) =10a(5) =6a(6) =25a(7) =4a(8) =0a(9) =14a(10) =8a(11) =50a(12) =5a(13) =9a(14) =21a(15) =0a(16) =43a(17) =23a(18) =6a(19) =154a(20) =11a(21) =16a(22) =26a(23) =56a(24) =12a(25) =7a(26) =49a(27) =34a(28) =40a(29) =342

External references