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A119173 Numbers n such that the n-th triangular number contains only digits {2,6,7}. 2

%I

%S 3,11,23,36,123,3651,394123,2307651,74534188,394392348,3639430251,

%T 1159885996348

%N Numbers n such that the n-th triangular number contains only digits {2,6,7}.

%C Next entry must be greater than 4.4*10^18.

%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr267.html">Tridigital Triangular Numbers</a>

%Y Cf. A000217, A119172. See A119034 for a table of cross-references.

%K nonn,base,more

%O 1,1

%A _Giovanni Resta_, May 10 2006

%E Lower bound for further terms updated by _Max Alekseyev_, May 07 2009

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Last modified July 21 19:13 EDT 2019. Contains 325199 sequences. (Running on oeis4.)