Primes of the form (3^n + 5^n)/2.

[zak seidov]

Thanks to all responding!!! 

Zak

Just submited:


%I A000001
%S A000001 19, 421, 10039, 95383574161, 2384331073699
%N A000001 Primes of the form (3^n+5^n)/2^3
%C A000001 Corresponding values of n's are 3, 5, 7,
17, 19.
There is only one prime of the form (3^n+5^n)/2^2 
(n=1, p=2),
and there are only three known primes of the form
(3^n+5^n)/2^1:
17, 353, 198593 (for n=2,4,8). Cf. A074606 3^n + 5^n
%Y A000001 A074606
%O A000001 1
%K A000001 ,more,nonn,
%A A000001 Zak Seidov, Sep 10 2006


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