[seqfan] Primes p such that sigma (p - 1) = sigma (p + 1)

Zak Seidov zakseidov at mail.ru
Thu May 5 17:50:00 CEST 2016

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 Primes p such that sigma (p - 1) = sigma (p + 1)
367, 919, 30593, 95393, ...?
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Zak

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