Numbers k such that the k-th triangular number contains only digits {5,6,8}.
A119221
Numbers k such that the k-th triangular number contains only digits {5,6,8}.
Terms
- a(0) =3a(1) =10a(2) =11a(3) =36a(4) =105a(5) =108a(6) =114a(7) =1316a(8) =3363a(9) =105516a(10) =343091a(11) =1316705a(12) =3657011a(13) =10638485a(14) =13310789a(15) =33336636a(16) =37028788a(17) =1145936870
External references
- oeis: A119221