Numbers k such that the k-th triangular number contains only digits {2,6,7}.

A119173

Numbers k such that the k-th triangular number contains only digits {2,6,7}.

Terms

    a(0) =3a(1) =11a(2) =23a(3) =36a(4) =123a(5) =3651a(6) =394123a(7) =2307651a(8) =74534188a(9) =394392348a(10) =3639430251

External references