id:A077695 - OEIS Search Results

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a(n) = triangular number pertaining to the number f(n) obtained by concatenating n n times.

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1, 253, 55611, 9876790, 1543206790, 222222111111, 30246911419753, 3950617249382716, 499999999500000000, 51015202530354045509590858075706560555, 617283950617283950617716049382716049382716 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n) = triangular number corresponding to A000461(n).`
	EXAMPLE	`a(4) = 9876790 = 4444*4445/2.`
	CROSSREFS	`Cf. A077692, A077693, A077694, A000461.` `Sequence in context: A054737 A123013 A006060 this_sequence A145628 A144855 A110827` `Adjacent sequences: A077692 A077693 A077694 this_sequence A077696 A077697 A077698`
	KEYWORD	`base,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 18 2002`
	EXTENSIONS	`More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Jan 07 2003`

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Last modified November 30 22:12 EST 2008. Contains 150989 sequences.

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