id:A128244 - OEIS Search Results

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Let be s the sum of the digits of n; a(n) is the product of the digits of s.

+0
1

1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 1, 2, 3, 4, 5, 6 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`The sequence is equal to A053837 up to the 488th term.`
	EXAMPLE	`a(345)=2 because 3+4+5=12 and 1*2=2`
	MAPLE	`P:=proc(n) local i, k, w; for i from 1 by 1 to n do w:=0; k:=i; while k>0 do w:=w+k-(trunc(k/10)10); k:=trunc(k/10); od; k:=w; w:=1; while k>0 do w:=w(k-(trunc(k/10)*10)); k:=trunc(k/10); od; print(w); od; end: P(500);`
	CROSSREFS	`Cf. A053837.` `Sequence in context: A071650 A037265 A053837 this_sequence A010888 A131650 A033930` `Adjacent sequences: A128241 A128242 A128243 this_sequence A128245 A128246 A128247`
	KEYWORD	`easy,nonn,base`
	AUTHOR	`Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), May 03 2007`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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