The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #9 Mar 14 2023 19:37:43
%S 3,55,300,3003,5050,500500,50005000,5000050000,33050333550,
%T 500000500000,3505500530535,50000005000000,53555035005300,
%U 355300503533550,5000000050000000,50035505550330300,300555503500333305,500000000500000000,50000000005000000000
%N Triangular numbers composed of digits {0,3,5}.
%H Giovanni Resta, <a href="http://www.numbersaplenty.com/tr/tr035.html">Tridigital Triangular Numbers</a>
%F a(n) = A000217(A119062(n)). - _Michel Marcus_, Mar 14 2023
%Y Cf. A000217, A119062. See A119033 for a table of cross-references.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, May 10 2006
%E a(17)-a(19) from _Tyler Busby_, Mar 14 2023