Numbers k such that the k-th triangular number contains only digits {1,5,8}.

A119137

Numbers k such that the k-th triangular number contains only digits {1,5,8}.

Terms

    a(0) =1a(1) =5a(2) =10a(3) =101a(4) =130a(5) =1078a(6) =1330a(7) =1541a(8) =4730a(9) =10114a(10) =12773a(11) =13330a(12) =41269a(13) =133330a(14) =1333330a(15) =13333330a(16) =133333330a(17) =1333333330a(18) =3430798394a(19) =5506103010a(20) =13333333330a(21) =108245601470a(22) =133333333330

External references