[seqfan] Re: 3, 251,?

Giovanni Resta g.resta at iit.cnr.it
Thu Jun 13 21:14:59 CEST 2013


On 06/13/2013 07:53 PM, юрий герасимов wrote:
>
> Hello, Seqfans,
> primes p such that both prevprime(n^2) - 2 and nextprime(p^2) + 2 are
> also primes: 3, 251,...
> What is the next one?

The first ones are
3, 251, 409, 647, 1031, 1669, 6469, 6679, 12043, 18313, 18517, 31583,
31643, 32957, 33479, 33529, 37783, 39733, 40163, 44071, 58441, 67189,
68279, 83009, 83117, 83423, 87671, 90481, 96001, 98479, 112951,
120011, 130211, 149939, 152297, 155663, 156227, 158293

Giovanni


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