Here is the link to a article in which this is asserted, and for which a proof is given.

keywords:

[Mathematics]

[Number Theory]

[Euler’s totient function]

[sum of squares]

[sum of 3 squares]

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# a factoid about the fraction 7/8: “The set of n for which ϕ(n) is a sum of three squares has asymptotic density 7/8.”

keywords:

[Mathematics]

[Number Theory]

[Euler’s totient function]

[sum of squares]

[sum of 3 squares]

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