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%I #8 Jul 13 2021 01:25:32
%S 10,100,124,375,1000,10000,100000,1000000,3924474,10000000,100000000,
%T 387492084,1000000000,3885885999,10000000000,31804089540,39371996915,
%U 100000000000,122929061474,1000000000000,10000000000000
%N Numbers k such that the k-th triangular number contains only digits {0,5,7}.
%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr057.html">Tridigital Triangular Numbers</a>
%Y Cf. A000217, A119081. See A119034 for a table of cross-references.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, May 10 2006
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