%I
%S 55,66,666,2211,222111,339900,1188111,22221111,88000011,111221155,
%T 553330011,2200066611,2222211111,2233558866,55666666611,77771144466,
%U 222222111111,880022001111,888000000111,1111226666655,5533355001111
%N Triangular numbers whose representation is made of nontrivial runs of identical digits.
%C A run of length 1 is trivial.
%e T(14914) = 111221155.
%Y Cf. A033023.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, Feb 13 2006
