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%I #11 Apr 06 2023 20:00:30
%S 1,3,1431,33411,331441131,1444343131,13113334431,31444341333441,
%T 111413314441131,444334341314331,11114441143333344141,
%U 331341331134344133331,4443314433131433343331311434133434431331
%N Triangular numbers composed of digits {1,3,4}.
%C a(14) > 10^41. - _Tyler Busby_, Mar 27 2023
%H Giovanni Resta, <a href="http://www.numbersaplenty.com/tr/tr134.html">Tridigital Triangular Numbers</a>.
%F a(n) = A000217(A119112(n)). - _Tyler Busby_, Mar 27 2023
%Y Cf. A000217, A053891, A119112. See A119033 for a table of cross-references.
%K nonn,base,more
%O 1,2
%A _Giovanni Resta_, May 10 2006
%E a(13) from _Tyler Busby_, Mar 27 2023
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