id:A131954 - OEIS Search Results

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A131954

a(n) = sum of digits of (n! + a(n-1)).

+0
5

1, 3, 9, 6, 9, 18, 18, 18, 36, 36, 45, 36, 36, 54, 54, 72, 72, 63, 54, 63, 72, 81, 108, 90, 81, 90, 117, 99, 144, 126, 144, 117, 153, 153, 153, 180, 162, 117, 198, 207, 153, 198, 198, 234, 216, 225, 234, 243, 234, 225, 207, 288, 297, 279, 297, 351, 279, 306, 333, 297 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n)=Sum_digits(n!+a(n-1))`
	EXAMPLE	`a(4)=9+4!=9+24=33 -> Sum_digits(33)=6`
	MAPLE	`P:=proc(n) local a, i, k, w; a:=0; for i from 1 by 1 to n do w:=0; k:=a+i!; while k>0 do w:=w+k-(trunc(k/10)*10); k:=trunc(k/10); od; a:=w; print(a); od; end: P(100);`
	CROSSREFS	`Cf. A055263, A131955.` `Sequence in context: A020834 A021720 A021256 this_sequence A134693 A096948 A016676` `Adjacent sequences: A131951 A131952 A131953 this_sequence A131955 A131956 A131957`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Jul 31 2007`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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