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Sequence generalized : a(n)=((A^n)-(B^r)/(A-B); A,B,r given integers.
Primes in this form are sometimes of interest.
Examples :
A=2;B=1;r=1 gives A000225 and A001348 primes in it;
A=3;B=1;r=1 gives A003462 and A028491 primes in it;
A=3;B=2;r=1 gives A058481 and A014224 primes in it;
A=4;B=1;r=1 gives A002450;
A=4;B=2;r=1 gives A083420;
A=4;B=2;r=2 gives A002446;
A=5;B=1;r=1 gives A003463 and A004061 primes in it;
A=5;B=2;r=1 gives A037577;
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