A141410 Denominator of A027760(n+1)/n.

1, 1, 2, 5, 3, 7, 4, 3, 5, 11, 6, 13, 7, 1, 8, 17, 9, 19, 10, 7, 11, 23, 12, 25, 13, 9, 14, 29, 15, 31, 16, 11, 17, 1, 18, 37, 19, 13, 20, 41, 21, 43, 22, 15, 23, 47, 24, 49, 25, 17, 26, 53, 27, 11, 28, 19, 29, 59, 30, 61

Offset: 2

Author

Paul Curtz, Aug 04 2008

Keywords

• nonn
• frac

Comments

The series of fractions A027760(n+1)/n = 2/2, 30/3, 2/4, 42/5, 2/6, 30/7, 2/8, 66/9, 2/10, ... = 1, 10, 1/2, 42/5, 1/3, 30/7, 1/4, ... for n>=2 is represented here by the reduced denominators.

Crossrefs

Cf. A141321.

Programs

Maple

A141410 := proc(n) A027760(n+1)/n ; denom(%) ; end proc:
seq(A141410(n),n=2..80) ; # R. J. Mathar, Jul 08 2011

Formula

a(2n) = n.