OFFSET
1,2
LINKS
Robert Israel, Table of n, a(n) for n = 1..103
EXAMPLE
a(3)=31 because 1/1 + 1/3 + 1/7 = 31/21.
MAPLE
a:= n -> numer(add(1/(2^j-1), j=1..n)); // Robert Israel, Dec 28 2012
MATHEMATICA
Numerator[Accumulate[1/(2^Range[20]-1)]] (* Harvey P. Dale, Dec 28 2012 *)
CROSSREFS
KEYWORD
frac,nonn
AUTHOR
Keenan Pepper, Sep 27 2003
EXTENSIONS
More terms from Ray Chandler, Oct 26 2003
STATUS
approved