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A140280 Product of digits of values in Pascal's triangle, by rows. 0
1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 1, 4, 6, 4, 1, 1, 5, 0, 0, 5, 1, 1, 6, 5, 0, 5, 6, 1, 1, 7, 2, 15, 15, 2, 7, 1, 1, 8, 16, 30, 0, 30, 16, 8, 1, 1, 9, 18, 32, 12, 12, 32, 18, 9, 1, 1, 0, 20, 0, 0, 20, 0, 0, 20, 0, 1, 1, 1, 25, 30, 0, 48, 48, 0, 30, 25, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

1

1, 1

1, 2, 1

1, 3, 3, 1

1, 4, 6, 4, 1

1, 5, 1*0=0, 1*0=0, 5, 1

1, 6, 1*5=5, 2*0=0, 1*5=5, 6, 1

1, 7, 2*1=2, 3*5=15, 3*5=15, 2*1=2, 7, 1

1, 8, 2*8=16, 5*6=30, 7*0=0, 5*6=30, 2*8=16, 8, 1

1, 9, 3*6=18, 8*4=32, 1*2*6=12, 1*2*6=12, 8*4=32, 3*6=18, 9, 1

1, 1*0=0, 4*5=20, 1*2*0=0, 2*1*0=0, 2*5*2=20, 2*1*0=0, 1*2*0=0, 4*5=20, 1*0=0, 1

1, 1*1=1, 5*5=25, 1*6*5=30, 3*3*0=0, 4*6*2=48, 4*6*2=48, 3*3*0=0, 1*6*5=30, 5*5=25, 1*1=1, 1

LINKS

Table of n, a(n) for n=1..78.

FORMULA

a(n) = A007954(A007318(n)).

CROSSREFS

Cf. A007318, A007954.

Sequence in context: A128629 A107065 A008975 * A140586 A095143 A242312

Adjacent sequences:  A140277 A140278 A140279 * A140281 A140282 A140283

KEYWORD

easy,nonn,tabl,base

AUTHOR

Jonathan Vos Post, May 31 2008

STATUS

approved

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Last modified January 27 04:57 EST 2020. Contains 331291 sequences. (Running on oeis4.)