Numbers k such that the k-th triangular number contains only digits {4,6,8}.

A119213

Numbers k such that the k-th triangular number contains only digits {4,6,8}.

Terms

    a(0) =3a(1) =11a(2) =36a(3) =131a(4) =411a(5) =1331a(6) =13331a(7) =35963a(8) =113916a(9) =133331a(10) =1333331a(11) =13333331a(12) =133333331a(13) =1333333331a(14) =13333333331a(15) =31141241043a(16) =133333333331

External references