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%I #8 Jul 13 2021 07:26:06
%S 3,10,11,36,71,105,114,230,714,2128,3363,10550,32411,73010,2309210,
%T 3648430,10641950,23045894,33336636,72479825,111581563,229156071,
%U 36118284988,730103037471,22915594088989,106039853513914
%N Numbers k such that the k-th triangular number contains only digits {2,5,6}.
%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr256.html">Tridigital Triangular Numbers</a>
%Y Cf. A000217, A119164. See A119034 for a table of cross-references.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, May 10 2006
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