id:A066621 - OEIS Search Results

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Concatenation of triangular numbers in increasing order up to the n-th and then in decreasing order.

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1, 131, 13631, 13610631, 136101510631, 1361015211510631, 13610152128211510631, 136101521283628211510631, 1361015212836453628211510631, 13610152128364555453628211510631 (list; graph; listen)

	OFFSET	`1,2`
	CROSSREFS	`Sequence in context: A161197 A104596 A091743 this_sequence A033530 A001295 A105684` `Adjacent sequences: A066618 A066619 A066620 this_sequence A066622 A066623 A066624`
	KEYWORD	`easy,nonn,base`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Dec 25 2001`
	EXTENSIONS	`More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Mar 23 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research