For a positive integer $n$, if both $n$ and $n 2$ are prime, then they are known as twin primes. For example, 59 and 61 are twin primes. Whether or not there are an infinite number of twin primes is a famous unsolved problem in number theory. Find all positive integers $n$ such that $n$, $n 2$, and $n 4$ are all prime.

plants store their excess carbohydrate in the form of starch so that it could be used as energy source later on. the excess carbohydrate is converted into starch in the plastid i.e. chloroplast & this process occurs in the presence of sunlight. it is an insoluble polymer of glucose which gets stored in cell organelles named as amyloplasts. in some plants, starch is also stored in roots and embryos.

chiken

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