1,1

Since there are only finitely many such numbers, the sum is rational.

Table of n, a(n) for n=1..104.

2009584261...2790050791 (1292 digits)

-------------------------------------- = 3.8984067369990536473445962607....

5154886078...0332960000 (1291 digits)

(MAGMA) m:=&+[1/k: k in [A009995(n)]]; Reverse(Intseq(Floor(10^104*m)))

Cf. A009995, A117914.

Sequence in context: A079591 A179047 A185067 * A197040 A217870 A154927

Adjacent sequences: A256952 A256953 A256954 * A256956 A256957 A256958

nonn,base,cons

Jaroslav Krizek, Apr 19 2015

approved