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Triangular numbers composed of digits {2,4,8}.
2

%I #12 Apr 06 2023 21:41:50

%S 28,48828,828828,842288428828,24884484228828,28284882828828,

%T 2842448222228428828

%N Triangular numbers composed of digits {2,4,8}.

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

%H Giovanni Resta, <a href="http://www.numbersaplenty.com/tr/tr248.html">Tridigital Triangular Numbers</a>.

%F a(n) = A000217(A119163(n)). - _Tyler Busby_, Mar 29 2023

%Y Cf. A000217, A027678, A119163. See A119033 for a table of cross-references.

%K nonn,base,more

%O 1,1

%A _Giovanni Resta_, May 10 2006