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Triangular numbers composed of digits {2,8,9}.
2

%I #11 Apr 06 2023 21:41:57

%S 28,828828,9298828,99228828,2882992822228828,88992922889298828,

%T 299282229288828999298828

%N Triangular numbers composed of digits {2,8,9}.

%C a(8) > 10^40. - _Tyler Busby_, Mar 29 2023

%H Giovanni Resta, <a href="http://www.numbersaplenty.com/tr/tr289.html">Tridigital Triangular Numbers</a>.

%F a(n) = A000217(A119181(n)). - _Tyler Busby_, Mar 29 2023

%Y Cf. A000217, A053935, A119181. See A119033 for a table of cross-references.

%K nonn,base,more

%O 1,1

%A _Giovanni Resta_, May 10 2006