A119070 - OEIS

%I #8 Jul 13 2021 01:25:13

%S 2,24,42,44,77,260,282,824,1364,8835,44517,88419,89375,256917,282842,

%T 426600,2603844,14141435,424287482,894359435,24629287602,81351102024,

%U 137064943244,1371082295364,2489711201364,8870066515082

%N Numbers k such that the k-th triangular number contains only digits {0,3,9}.

%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr039.html">Tridigital Triangular Numbers</a>

%Y Cf. A000217, A119069. See A119034 for a table of cross-references.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, May 10 2006