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COMMENTS
| p^2 divides a(n) = (p + 1)^p - 1, p = Prime[n]. Quotients a(n)/Prime[n]^2 are listed in A137665(n) = {2,7,311,42799,6140565047,4696537119847,7563707819165039903,...}. Least prime factors of A137665(n) = a(n)/Prime[n]^2 are listed in A128456(n) = {2,7,311,127,23,157,7563707819165039903,...}. Largest prime factors A137665(n) = a(n)/Prime[n]^2 are listed in A137666(n) = {2,7,311,337,266981089,29914249171,7563707819165039903,...}.
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