id:A068899 - OEIS Search Results

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Triangular numbers containing 2n digits obtained by duplicating the first n digits; i.e. triangular numbers in A020338.

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55, 66, 5050, 5151, 203203, 255255, 426426, 500500, 501501, 581581, 828828, 930930, 39653965, 50005000, 50015001, 61566156, 3347133471, 5000050000, 5000150001, 6983669836, 220028220028, 500000500000, 500001500001 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`The sequence is infinite: the 10^n-th and the (10^n + 1)-th triangular numbers are members. It is a sub sequence of A068898.`
	CROSSREFS	`Cf. A068898, A020338.` `Sequence in context: A004434 A116055 A068898 this_sequence A053719 A050781 A060260` `Adjacent sequences: A068896 A068897 A068898 this_sequence A068900 A068901 A068902`
	KEYWORD	`easy,nonn,base`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 21 2002`
	EXTENSIONS	`Corrected and extended by Larry Reeves (larryr(AT)acm.org), Jan 10 2003`

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Last modified December 6 11:04 EST 2009. Contains 170427 sequences.

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