id:A127554 - OEIS Search Results

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Sum of the digits of left factorial !n.

+0
1

0, 1, 2, 4, 1, 7, 10, 19, 19, 19, 19, 28, 37, 37, 55, 55, 37, 46, 46, 73, 73, 64, 82, 100, 100, 118, 109, 100, 127, 127, 145, 118, 163, 145, 154, 172, 172, 154, 181, 181, 199, 172, 226, 208, 253, 226, 262, 262, 253, 271, 235, 271, 262, 280, 325, 325, 307, 343, 334 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n) = A007953(A003422(n)). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 22 2007`
	EXAMPLE	`!5 = 0!+1!+2!+3!+4! = 1+1+2+6+24 = 34 --> 3+4=7.`
	MAPLE	`P:=proc(n) local a, i, k, w; a:=0; for i from 1 by 1 to n do w:=0; k:=(i-1)!+a; a:=k; while k>0 do w:=w+k-(trunc(k/10)*10); k:=trunc(k/10); od; print(w); od; end: P(100);`
	CROSSREFS	`Cf. A003422.` `Sequence in context: A105552 A112852 A121531 this_sequence A103324 A087060 A065278` `Adjacent sequences: A127551 A127552 A127553 this_sequence A127555 A127556 A127557`
	KEYWORD	`easy,nonn,base`
	AUTHOR	`Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Apr 17 2007`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

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