A087052 - OEIS

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A087052

Dismal triangular numbers: 0+1+2+3+...+n, where + is dismal addition.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 59, 59, 59, 59, 59, 59, 59, 59, 59, 59, 69, 69, 69, 69, 69, 69, 69, 69, 69, 69, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 199, 199, 199, 199, 199, 199, 199, 199, 199, 199, 199, 199, 199, 199, 199, 199, 199, 199, 199, 199, 199 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,3`
	COMMENTS	`Differs from A087121 after 100 terms.` `If duplicates are removed we get A051885. - N. J. A. Sloane, Jan 25 2011`
	LINKS	`Table of n, a(n) for n=0..120.` `D. Applegate, C program for dismal arithmetic and number theory` `D. Applegate, M. LeBrun and N. J. A. Sloane, Dismal Arithmetic` `Index entries for sequences related to dismal arithmetic`
	MAPLE	`(Continuing from A087062) dt := proc(n) local i, t1; t1 := 0; for i from 1 to n do t1 := dadd(t1, i); od: t1; end;`
	CROSSREFS	`Cf. A051885.` `Sequence in context: A174025 A106649 A087121 * A117241 A077557 A075517` `Adjacent sequences: A087049 A087050 A087051 * A087053 A087054 A087055`
	KEYWORD	`nonn`
	AUTHOR	`Marc LeBrun and N. J. A. Sloane, Oct 19 2003`
	STATUS	`approved`

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Last modified May 20 02:57 EDT 2013. Contains 225446 sequences.