%I

%S 5,5,5,5,13,283,283,1823,443119823,35332754383,57704757113,

%T 69478435945493,2235755385712423

%N Initial prime, greater than 3, of a prime chain of length n under the iteration x->2x-3.

%e a(3) = 5 because 5, 5*2-3=7, 7*2-3=11 and 11*2-3=19 are primes.

%Y Cf. A084954.

%K nonn,more

%O 1,1

%A _Don Reble_, Nov 07 2007