Numbers k such that the k-th triangular number contains only digits {1,6,8}.
A119143
Numbers k such that the k-th triangular number contains only digits {1,6,8}.
Terms
- a(0) =1a(1) =3a(2) =11a(3) =36a(4) =41a(5) =483a(6) =1541a(7) =4041a(8) =36908a(9) =127958a(10) =603136a(11) =1110753a(12) =1795333a(13) =3518005633a(14) =4046896633a(15) =11055868678a(16) =37045070336a(17) =47289885136
External references
- oeis: A119143