1,3
Triangular numbers can not be so arranged.
Cf. A114030.
Adjacent sequences: A114026 A114027 A114028 this_sequence A114030 A114031 A114032
Sequence in context: A071882 A081482 A134475 this_sequence A013171 A073422 A006525
base,more,nonn
Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 13 2005
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