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A119145 Numbers k such that the k-th triangular number contains only digits {1,6,9}. 2

%I #8 Jul 13 2021 07:26:35

%S 1,3,11,13,36,1386,1411,1543,438433,445241,5685366,19849388,36385963,

%T 154671711,199808366,1408518133,3497461911,184180138433,1350308625456,

%U 4892835517288,11505747426366,118253893522536,447137831091711

%N Numbers k such that the k-th triangular number contains only digits {1,6,9}.

%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr169.html">Tridigital Triangular Numbers</a>

%Y Cf. A000217, A119144. See A119034 for a table of cross-references.

%K nonn,base

%O 1,2

%A _Giovanni Resta_, May 10 2006

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Last modified June 21 01:33 EDT 2024. Contains 373535 sequences. (Running on oeis4.)