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Numbers k such that the k-th triangular number contains only digits {0,3,4}.
2

%I #8 Jul 13 2021 01:20:40

%S 2,24,77,82,2624,26242,29442,82877,2840082,82825117,93091399,

%T 774641122,816508460,9423378739,81731319999,246333119999,

%U 2976590096077,8164967169602

%N Numbers k such that the k-th triangular number contains only digits {0,3,4}.

%C Next term exceeds 1.4*10^16.

%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr034.html">Tridigital Triangular Numbers</a>

%Y Cf. A000217, A119059. See A119034 for a table of cross-references.

%K nonn,base,more

%O 1,1

%A _Giovanni Resta_, May 10 2006