[seqfan] 5, 20, 120, 540, 6480, ...

Tomasz Ordowski tomaszordowski at gmail.com
Wed Mar 30 15:18:02 CEST 2022


Dear readers!

Let a(n) = Product_{k=1..n} (prime(k+1)+prime(k))/(prime(k+1)-prime(k)).
Conjecture: a(n) is an integer for every natural n.
Is it known or provable?

Best regards,

Thomas Ordowski


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