A165658 Denominators of A002110 divided by A102647, starting from the second term of both.

1, 1, 1, 4, 6, 48, 64, 96, 576, 1728, 13824, 165888, 1036800, 9953280, 119439360, 297271296, 134369280000, 222953472000, 75246796800, 32105299968000, 229323571200, 568865783808000000, 125150472437760000, 6129819058176000

Offset: 1

Author

Creighton Dement, Sep 24 2009

Keywords

• easy
• nonn

Crossrefs

Cf. A002110, A102647, A165657, A165659, A165660.

Programs

PARI

a1(n)=prod(i=1, n, prime(i));
b1(n)=prod(i=1, n, prime(n+1)%prime(i));
a(n)=if(n<0, 0, denominator(a1(n)/b1(n)));
for(n=1, 25, print1(a(n) ", "))