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%I #12 Mar 29 2023 17:17:02
%S 45,55,48555585,84844484544485445,44585455858455488585854455,
%T 445544585455555888554444445,455888444844584444558845455,
%U 5858855485848545848448855845485
%N Triangular numbers composed of digits {4,5,8}.
%C a(9) > 10^40. - _Tyler Busby_, Mar 29 2023
%H Giovanni Resta, <a href="http://www.numbersaplenty.com/tr/tr458.html">Tridigital Triangular Numbers</a>.
%F a(n) = A000217(A119207(n)). - _Jon E. Schoenfield_, Mar 27 2023
%Y Cf. A000217, A053953, A119207. See A119033 for a table of cross-references.
%K nonn,base,more
%O 1,1
%A _Giovanni Resta_, May 10 2006