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%I #8 Jul 13 2021 01:25:16
%S 9,10,89,100,899,900,1000,8989,9000,10000,30134,31624,90000,95289,
%T 100000,900000,953944,1000000,9000000,10000000,10044944,32880100,
%U 90000000,100000000,900000000,1000000000,3328800100,9000000000
%N Numbers k such that the k-th triangular number contains only digits {0,4,5}.
%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr045.html">Tridigital Triangular Numbers</a>
%Y Cf. A000217, A119071. See A119034 for a table of cross-references.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, May 10 2006