A119207 - OEIS

%I #7 Jul 13 2021 21:30:09

%S 9,10,9854,411933209,9443035090314,29851116744790,30195643554810,

%T 3423114221246070

%N Numbers k such that the k-th triangular number contains only digits {4,5,8}.

%C Next term exceeds 1.4*10^16.

%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr458.html">Tridigital Triangular Numbers</a>

%Y Cf. A000217, A119206. See A119034 for a table of cross-references.

%K nonn,base,more

%O 1,1

%A _Giovanni Resta_, May 10 2006