Numbers k such that the k-th triangular number contains only digits {5,6,9}.
A119223
Numbers k such that the k-th triangular number contains only digits {5,6,9}.
Terms
- a(0) =3a(1) =10a(2) =11a(3) =34a(4) =36a(5) =105a(6) =109a(7) =114a(8) =3363a(9) =13834a(10) =438109a(11) =1383471a(12) =3622034a(13) =10954411a(14) =11537388a(15) =33336636a(16) =105517363a(17) =141114114a(18) =3333366765
External references
- oeis: A119223