j
k
j a
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What is sigma(n) ? —Dan
On Nov 20, 2015, at 5:05 PM, David Wilson <davidwwilson@comcast.net> wrote: Is 1. Is phi(n) + sigma(n) - 2n >= 0 for all n > 1? 2. Is phi(n) + sigma(n) - 2n = 5 for any n?
On Nov 20, 2015, at 5:05 PM, David Wilson <davidwwilson@comcast.net> wrote:
Is
1. Is phi(n) + sigma(n) - 2n >= 0 for all n > 1?
2. Is phi(n) + sigma(n) - 2n = 5 for any n?
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