id:A004157 - OEIS Search Results

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Sum of digits of n-th triangular number.

+0
3

0, 1, 3, 6, 1, 6, 3, 10, 9, 9, 10, 12, 15, 10, 6, 3, 10, 9, 9, 10, 3, 6, 10, 15, 3, 10, 9, 18, 10, 12, 15, 19, 15, 12, 19, 9, 18, 10, 12, 15, 10, 15, 12, 19, 18, 9, 10, 12, 15, 10, 15, 12, 19, 9, 18, 10, 21, 15, 10, 15, 12, 19, 18, 9, 10, 12, 6, 19, 15, 12, 19, 18, 18, 10, 21, 15, 19, 6, 12, 10 (list; graph; listen)

	OFFSET	`0,3`
	MAPLE	`P:=proc(n) local a, i, k, w; a:=0; for i from 1 by 1 to n do a:=a+i; w:=0; k:=a; while k>0 do w:=w+k-(trunc(k/10)*10); k:=trunc(k/10); od; print(w); od; end: P(100); - Paolo P. Lava (ppl(AT)spl.at), May 03 2007`
	CROSSREFS	`Cf. A000217, A145389.` `Sequence in context: A134804 A145389 A055263 this_sequence A091068 A065233 A072452` `Adjacent sequences: A004154 A004155 A004156 this_sequence A004158 A004159 A004160`
	KEYWORD	`nonn,base`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified December 18 21:37 EST 2009. Contains 171024 sequences.

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