%I #8 Jul 13 2021 07:26:03
%S 7,312,1287,1297912,7054712,7521287,2384302087
%N Numbers k such that the k-th triangular number contains only digits {2,4,8}.
%C Next term exceeds 1.4*10^16.
%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr248.html">Tridigital Triangular Numbers</a>
%Y Cf. A000217, A119162. See A119034 for a table of cross-references.
%K nonn,base,more
%O 1,1
%A _Giovanni Resta_, May 10 2006