Numbers k such that the k-th triangular number contains only digits {3,6,9}.
A119199
Numbers k such that the k-th triangular number contains only digits {3,6,9}.
Terms
- a(0) =2a(1) =3a(2) =8a(3) =11a(4) =36a(5) =816a(6) =1368a(7) =1388a(8) =2816a(9) =89408a(10) =445788a(11) =11284236a(12) =26064036a(13) =35598783a(14) =281768343a(15) =1414001388a(16) =8594921016
External references
- oeis: A119199