Authors: Simon Plouffe
In 1947, W. H. Mills published a paper describing a formula that gives primes : if A = 1.3063778838630806904686144926… then ⌊A^(3^n ) ⌋ is always prime, here ⌊x⌋ is the integral part of x. Later in 1951, E. M. Wright published another formula, if g_0=α = 1.9287800… and g_(n+1)=2^(g_n ) then ⌊g_n ⌋= ⌊2^(…2^(2^α ) ) ⌋ is always prime. The primes are uniquely determined by α , the prime sequence is 3, 13, 16381, … The growth rate of these functions is very high since the fourth term of Wright formula is a 4932 digit prime and the 8’th prime of Mills formula is a 762 digit prime. A new set of formulas is presented here, giving an arbitrary number of primes minimizing the growth rate. The first one is : if a_0=43.8046877158…and a_(n+1)= 〖〖〖(a〗_n〗^(5/4))〗^n , then if S(n) is the rounded values of a_n, S(n) = 113,367,102217,1827697,67201679,6084503671, …. Other exponents can also give primes like 11/10, or 101/100. If a_0 is well chosen then it is conjectured that any exponent > 1 can also give an arbitrary series of primes. The method for obtaining the formulas is explained. All results are empirical.
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