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Numbers k such that the k-th triangular number contains only digits {2,6,9}.
2

%I #12 Mar 31 2023 02:49:24

%S 3,11,36,76,7741188,21305723,4471447856,24343059348,6673334543723,

%T 23094123478785548

%N Numbers k such that the k-th triangular number contains only digits {2,6,9}.

%H Giovanni Resta, <a href="http://www.numbersaplenty.com/tr/tr269.html">Tridigital Triangular Numbers</a>.

%Y Cf. A000217, A119176. See A119034 for a table of cross-references.

%K nonn,base,more

%O 1,1

%A _Giovanni Resta_, May 10 2006

%E a(10) from _Tyler Busby_, Mar 31 2023