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Numbers k such that the k-th triangular number contains only digits {2,4,6}.
2

%I #11 Jul 13 2021 07:26:00

%S 3,11,36,923,23076,211963,9656548,35906663076,9635790203866668,

%T 35401826004387588

%N Numbers k such that the k-th triangular number contains only digits {2,4,6}.

%C Next term exceeds 3.1*10^18.

%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr246.html">Tridigital Triangular Numbers</a>

%Y Cf. A000217, A119160. 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 _Max Alekseyev_, Jun 16 2011