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if 2^k-1 is a prime then it generates a perfect number using the formula 2^(k-1) x (2^k -1) - try it on your laptop
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Unisex organic cotton t-shirt: Superatom – Paul Sutter’s cooler name for a Rydberg Polaron! Mars if 2^k-1 is a primeDESIGN BACKSTORY In the physics bough of the knowledge tree condensed matter physics is a less well known branch than that of particle physics, astrophysics or cosmology. Yet condensed matter physicists study the everyday matter all around us and how it behaves. Just like tribologists things go a lot more smoothly when the expertise of condensed matter physicists is applied to the materials used in our cyberphysical world. In his excellent Ask A