Numbers k such that the k-th triangular number contains only digits {2,6,8}.

A119175

Numbers k such that the k-th triangular number contains only digits {2,6,8}.

Terms

    a(0) =3a(1) =7a(2) =11a(3) =36a(4) =72a(5) =676a(6) =1287a(7) =2108a(8) =11512a(9) =21112a(10) =23927a(11) =35447a(12) =37112a(13) =41527a(14) =67323a(15) =35289847a(16) =41633847a(17) =11684368072a(18) =24026103588a(19) =364110500487

External references