The Niven constant is 1 + Sum(1-1/Zeta(n),n=2..infinity),
was easily evaluated by Maple to 256 digits.

1.705211140105367764288551453434508160762027651653469099994284906547313192168122491934244132100871\
00179765382704764978904313871125998059669293482698133268217903875512253890093587446755241925052932\
7953221537146896533407937145250019918180145102784325930662341:


The sum relates to an on-line article of Steve Finch, originated in an article
of I. Niven : Averages of exponents in factoring integers, Proc. Amer. Math. Soc., 22 (1969) 356-360. 
For an interesting account see 
http://pauillac.inria.fr/algo/bsolve/niven/niven.html





































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