Numbers k such that the k-th triangular number contains only digits {5,6,7}.
A119219
Numbers k such that the k-th triangular number contains only digits {5,6,7}.
Terms
- a(0) =3a(1) =10a(2) =11a(3) =36a(4) =105a(5) =114a(6) =3363a(7) =3369a(8) =3648a(9) =10636a(10) =1073010a(11) =1164274a(12) =33336636a(13) =33336696a(14) =107290789a(15) =1063736505a(16) =3887841963
External references
- oeis: A119219