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Numbers k such that the k-th triangular number contains only digits {0,2,9}.
2

%I #10 Jul 13 2021 01:21:02

%S 44,64656155,429439844,632914215,21072266180

%N Numbers k such that the k-th triangular number contains only digits {0,2,9}.

%C Next term must be greater than 1.4*10^20. - _Max Alekseyev_, Aug 14 2013

%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr029.html">Tridigital Triangular Numbers</a>

%Y Cf. A000217, A119057. See A119034 for a table of cross-references.

%K nonn,base,more

%O 1,1

%A _Giovanni Resta_, May 10 2006