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A119235 Numbers k such that the k-th triangular number contains only digits {6,8,9}. 2

%I

%S 3,11,36,371211,421186108,1180677745929588

%N Numbers k such that the k-th triangular number contains only digits {6,8,9}.

%C Next term exceeds 4.4*10^18.

%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr689.html">Tridigital Triangular Numbers</a>

%Y Cf. A000217, A119234. See A119034 for a table of cross-references.

%K nonn,base,more

%O 1,1

%A _Giovanni Resta_, May 10 2006

%E Lower bound updated by _Max Alekseyev_, Apr 30 2010

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Last modified August 3 02:48 EDT 2021. Contains 346435 sequences. (Running on oeis4.)