Helen Arney
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Mersenne 48: Helen Arney's song for the largest known prime number

At the start of 2013, the world's largest known prime number was discovered by a mathematician in the US, Curtis Cooper.

It was the 48th so-called Mersenne prime number and it has more than 17 million digits.

Radio 4 programme More or Less asked comedian Helen Arney, a self-confessed "geek songstress", to pen a melodic homage to Mersenne 48.

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