- Here is a fact:

No number of the form 4*b^n+/-1 with b==14mod15 is prime.

Does this mean that when b not 14mod15 there is an increased chance of

primes and twins over normal probabilities or are such forms 4*x+/-1,

with x in the form b^n just less prime. My gut feel tells me that the

former is the case.

Regards

Robert Smith - --- In primenumbers@yahoogroups.com, "Robert" <robert_smith44@...> wrote:
>

Should have thought more before I posted. All numbers of the stated

> Here is a fact:

>

> No number of the form 4*b^n+/-1 with b==14mod15 is prime.

>

> Does this mean that when b not 14mod15 there is an increased chance of

> primes and twins over normal probabilities or are such forms 4*x+/-1,

> with x in the form b^n just less prime. My gut feel tells me that the

> former is the case.

>

> Regards

>

> Robert Smith

>

form are divisible by 3 or 5, so my gut feeling is correct, there is

an increased chance that 4*b^n+/-1; b not 14mod15; are prime. It is

just a partial sieve.