A119120 - OEIS

%I #10 Jul 13 2021 07:32:12

%S 1,2,421,1541,8753,150421,12914246,1327696379533,4034385661121,

%T 605166395826533,16360402306368458,249752330575267378

%N Numbers k such that the k-th triangular number contains only digits {1,3,8}.

%C Next term exceeds 4.4*10^18.

%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr138.html">Tridigital Triangular Numbers</a>

%Y Cf. A000217, A119119. See A119034 for a table of cross-references.

%K nonn,base,more

%O 1,2

%A _Giovanni Resta_, May 10 2006

%E Two more terms from _Max Alekseyev_, May 12 2009