OFFSET
1,1
COMMENTS
Apart from 3 all terms are even.
LINKS
Paolo P. Lava, Table of n, a(n) for n = 1..200
EXAMPLE
Prime factors of 11316 are 2^2, 3, 23 and 41.
Sum_{i=1..5} (p(i)/(p(i)-1)) = 2*(2/(2-1)) + 3/(3-1) + 23/(23-1) + 41/(41-1) = 3331/440.
Sroduct_{i=1..5} (p(i)/(p(i)-1)) = 2*(2/(2-1)) * 3/(3-1) * 23/(23-1) * 41/(41-1) = 2829/440.
Their sum is an integer: 3331/440 + 2829/440 = 14.
MAPLE
CROSSREFS
KEYWORD
nonn
AUTHOR
Paolo P. Lava, Apr 19 2013
STATUS
approved