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A119213 Numbers k such that the k-th triangular number contains only digits {4,6,8}. 2

%I #7 Jul 13 2021 21:30:38

%S 3,11,36,131,411,1331,13331,35963,113916,133331,1333331,13333331,

%T 133333331,1333333331,13333333331,31141241043,133333333331,

%U 1333333333331,4110641475211,13333333333331,133333333333331

%N Numbers k such that the k-th triangular number contains only digits {4,6,8}.

%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr468.html">Tridigital Triangular Numbers</a>

%Y Cf. A000217, A119212. See A119034 for a table of cross-references.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, May 10 2006

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Last modified April 25 04:42 EDT 2024. Contains 371964 sequences. (Running on oeis4.)