Numbers k such that the k-th triangular number contains each of the 10 decimal digits exactly once.

Terms

a(0) =46097a(1) =49796a(2) =50139a(3) =55151a(4) =55484a(5) =56520a(6) =58050a(7) =62495a(8) =62567a(9) =62900a(10) =66294a(11) =68805a(12) =69542a(13) =70766a(14) =72594a(15) =73737a(16) =73971a(17) =74168a(18) =74357a(19) =75555a(20) =76364a(21) =77805a(22) =78686a(23) =78848a(24) =84555a(25) =85959a(26) =86076a(27) =87263a(28) =87669a(29) =88406