A007689: all terms composite?

[zak seidov]

Dear seqfans,

A007689 
2,5,13,35,97,275,793,2315,6817,20195,60073,179195,535537
Name:    2^n + 3^n.
Formula:    a(n) = 5*a(n-1)-6*a(n-2).
Offset:    0
Author(s): njas, Robert G. Wilson v (rgwv(AT)rgwv.com)

For n=1,3,5,7,... a(n) are divisible by 5; 
a(n) are primes for n=0,1,2,4.
My Q: what about other terms a(2k), 
are they all composite?
Thanks, zak


		
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