A066621 - OEIS

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A066621

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

1, 131, 13631, 13610631, 136101510631, 1361015211510631, 13610152128211510631, 136101521283628211510631, 1361015212836453628211510631, 13610152128364555453628211510631 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	LINKS	`Table of n, a(n) for n=1..10.`
	CROSSREFS	`Sequence in context: A322881 A104596 A091743 * A239252 A200736 A287071` `Adjacent sequences: A066618 A066619 A066620 * A066622 A066623 A066624`
	KEYWORD	`easy,nonn,base`
	AUTHOR	`Amarnath Murthy, Dec 25 2001`
	EXTENSIONS	`More terms from Sascha Kurz, Mar 23 2002`
	STATUS	`approved`

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Last modified December 11 11:25 EST 2023. Contains 367724 sequences. (Running on oeis4.)