Let A = {1,4,6, ...} be a set of natural numbers n for which n is the product of an even number of primes and n+1 is the product of an odd number of primes (taking into account the multiplicity of prime powers). Prove that the series of the reciprocals of the elements of A is divergent. In other words, A={n∣λ(n)=1 and λ(n+1)=−1} , where λ is the liouville lambda function. number theoryreal analysis