A064539 All...are divisible by 3 but why?

[Hans Havermann]

zak:

> For n=1,28 we have the only two primes of the form 3^(2n)+(2n)^3

Hugo Pfoertner:

> I checked (using PFGW) up to n=3500 and found no further prime.


3^(2n)+(2n)^3 is a probable prime for n=5056.
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