A140280 Product of digits of values in Pascal's triangle, by rows.

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

Offset

0,5

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=0..77.

Formula

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

Crossrefs

Cf. A007318, A007954.

Sequence in context: A128629 A107065 A008975 * A140586 A339379 A095143

Adjacent sequences: A140277 A140278 A140279 * A140281 A140282 A140283

Keyword

easy,nonn,tabl,base

Author

Jonathan Vos Post, May 31 2008

Extensions

Offset changed to 0 by Georg Fischer, Dec 19 2020

Status

approved