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A128244 Let be s the sum of the digits of n; a(n) is the product of the digits of s. 0
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; refs; listen; history; internal format)
OFFSET

0,2

COMMENTS

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 * A010888 A177274 A131650

Adjacent sequences:  A128241 A128242 A128243 * A128245 A128246 A128247

KEYWORD

easy,nonn,base

AUTHOR

Paolo P. Lava & Giorgio Balzarotti (paoloplava(AT)gmail.com), May 03 2007

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Last modified February 14 06:20 EST 2012. Contains 205570 sequences.