|
%I #8 Jul 13 2021 07:26:35
%S 1,3,11,13,36,1386,1411,1543,438433,445241,5685366,19849388,36385963,
%T 154671711,199808366,1408518133,3497461911,184180138433,1350308625456,
%U 4892835517288,11505747426366,118253893522536,447137831091711
%N Numbers k such that the k-th triangular number contains only digits {1,6,9}.
%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr169.html">Tridigital Triangular Numbers</a>
%Y Cf. A000217, A119144. See A119034 for a table of cross-references.
%K nonn,base
%O 1,2
%A _Giovanni Resta_, May 10 2006
|
