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%I #8 Mar 28 2023 08:00:55
%S 55,5050,500500,50005000,5000050000,500000500000,558080805855,
%T 50000005000000,808505508008850,5000000050000000,500000000500000000,
%U 50000000005000000000,5000000000050000000000,5055055888880005805800,500000000000500000000000
%N Triangular numbers composed of digits {0,5,8}.
%H Giovanni Resta, <a href="http://www.numbersaplenty.com/tr/tr058.html">Tridigital Triangular Numbers</a>.
%F a(n) = A000217(A119084(n)). - _Tyler Busby_, Mar 27 2023
%Y Cf. A000217, A119084. See A119033 for a table of cross-references.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, May 10 2006
%E a(15) from _Tyler Busby_, Mar 27 2023