A bemirp (or bi-directional emirp) is a
prime that yields a different prime when turned upside
down with reversals of each being two more different
primes. The result is four different associated primes.
E.g., 1061 turned upside down yields 1901, and the
reversals of these are 1601 and 1091 respectively.
Sariyar discovered that
1888691180161 is a bemirp because
the following four are primes:
Morover, Sariyar discovered the
π(x) is prime when x is sustituted by the first three
π(1888691180161) = 69368137291 is prime
π(1888961180191) = 69377688539 is prime
π(1910811698881) = 70150532951 is prime.
π(161081196881) = 59510529369 is a composite equal to
3^2 × 883 × 7488427