

A068144


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


1



36, 66, 136, 153, 378, 666, 1128, 1378, 1711, 2145, 3003, 3321, 3655, 3741, 3916, 4656, 6105, 6216, 6328, 6786, 6903, 10153, 11325, 11628, 11781, 13366, 13861, 16110, 19110, 21115, 21321, 21528, 32131, 33153, 35511, 35778, 36315, 39903
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OFFSET

1,1


LINKS

Jon E. Schoenfield, Table of n, a(n) for n = 1..1000


EXAMPLE

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


CROSSREFS

Cf. A000217.
Sequence in context: A176623 A211724 A250771 * A182428 A208128 A260919
Adjacent sequences: A068141 A068142 A068143 * A068145 A068146 A068147


KEYWORD

nonn,base


AUTHOR

Amarnath Murthy, Feb 23 2002


EXTENSIONS

Corrected and extended by Jon E. Schoenfield, Sep 06 2006
Edited by Charles R Greathouse IV, Apr 28 2010


STATUS

approved



