Pairs with common factors: Difference between revisions
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further clarification
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<big>''a(n) = n × (n-1) / 2 + 1 - 𝚺{i=1..n} 𝚽(i)''</big>
where 𝚽() is Phi; the Euler totient function.
For the term '''a(p)''', if '''p''' is prime, then '''a(p)''' is equal to the previous term.
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