%I #10 Mar 30 2012 19:00:28
%S 1,3,6,10,15,36,66,105,153,666
%N Right-truncatable triangular numbers: every prefix is triangular number.
%C This sequence is finite with 10 terms.
%Y Cf. A000217 (triangular numbers).
%K nonn,base,fini,full
%O 1,2
%A _Jaroslav Krizek_, Dec 25 2011
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