A119195 - OEIS

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A119195

Numbers k such that the k-th triangular number contains only digits {3,6,7}.

%I #7 Jul 13 2021 21:29:06

%S 2,3,8,11,36,391,816,8563,39183,2594751,12436829803183

%N Numbers k such that the k-th triangular number contains only digits {3,6,7}.

%C Next term exceeds 1.4*10^16.

%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr367.html">Tridigital Triangular Numbers</a>

%Y Cf. A000217, A119194. See A119034 for a table of cross-references.

%K nonn,base,more

%O 1,1

%A _Giovanni Resta_, May 10 2006