A269626 a(n) = A003418(n) / A058312(n) with a(0) = 1.

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 55, 55, 55, 55, 55, 55, 55

Offset: 0

Author

Jeppe Stig Nielsen, Mar 01 2016

Keywords

• nonn

Crossrefs

Cf. A003418, A058312, A110566.

Programs

PARI

a(n)=lcm([1..n])/denominator(sum(k=1,n,(-1)^(k+1)/k))