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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)
48% polyester • Fabric weight: 4
• Fabric weight: 7
We need to do a better job of looking after Earth’s ecological niches (eg forests
its interior is fully lined with faux fur and its made from a material that’s resistant to water
Unisex organic cotton t-shirt - Evolution By Natural Selection Geek if 2^k-1 is a primeThe blind watchmaker tries many experimental mixings of DNA. Some results survive, thrive and multiply many others don't. YOU are the result of 4 billion years of evolution on our pale blue dot of Earth, behave like it and act responsibly Made from 100% organic ring spun cotton, this is a high quality, super comfy and eco friendly unisex t shirt. 100% organic ring spun cotton Fabric weight: 5. 3 oz yd (180 g m) Single jersey Medium fit Set in sleeves