The series of reciprocals of all prime divisors of Fermat numbers is convergent. The sum of the reciprocals of Chen primes converges. Those reciprocals of primes can be associated with several sequences of repeating decimals. Such numbers are infinite, and their reciprocals are infinitesimals. The eigenvalues for a hyperbolic element are both real, and are reciprocals. He proved that the sum of the reciprocals of the primes diverges. Other verb forms include causatives, reciprocals, and reflexives. The sum of the reciprocals of the powerful numbers converges. The sum of the reciprocals of the squared powers of two is 1/3. Likewise, the other scaled parameters, fractional bandwidth and are also reciprocals of each other. The infinite sum of the reciprocals of all pentatope numbers is . Resistivity and conductivity are reciprocals&colon; formula 6. Resistivity and conductivity are reciprocals&colon; formula 3. The square roots and reciprocals of successive natural numbers do not obey this law. The sum of the reciprocals of the powers of two is 1.