A069047 Denominator(sum(i=1,n,1/i^4))/denominator(sum(i=1,n,1/i^3)).

1, 2, 6, 12, 60, 540, 3780, 7560, 2520, 2520, 27720, 27720, 360360, 360360, 360360, 720720, 12252240, 110270160, 2095133040, 10475665200, 1496523600, 1496523600, 34420042800, 34420042800, 34420042800, 34420042800

Offset

1,2

Links

Table of n, a(n) for n=1..26.

Crossrefs

Sequence in context: A090951 A168262 A085819 * A095921 A106037 A136240

Adjacent sequences: A069044 A069045 A069046 * A069048 A069049 A069050

Keyword

easy,nonn

Author

Benoit Cloitre, Apr 03 2002

Status

approved