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Triangular numbers which are a concatenation of two or more positive triangular numbers.
1

%I #11 Dec 05 2013 19:55:10

%S 36,66,136,153,378,666,1128,1378,1711,2145,3003,3321,3655,3741,3916,

%T 4656,6105,6216,6328,6786,6903,10153,11325,11628,11781,13366,13861,

%U 16110,19110,21115,21321,21528,32131,33153,35511,35778,36315,39903

%N Triangular numbers which are a concatenation of two or more positive triangular numbers.

%H Jon E. Schoenfield, <a href="/A068144/b068144.txt">Table of n, a(n) for n = 1..1000</a>

%e 1378 is the concatenation of 1, 3 and 78. 16110 is the concatenation of 1, 6, 1 and 10.

%Y Cf. A000217.

%K nonn,base

%O 1,1

%A _Amarnath Murthy_, Feb 23 2002

%E Corrected and extended by _Jon E. Schoenfield_, Sep 06 2006

%E Edited by _Charles R Greathouse IV_, Apr 28 2010