111110100001domain: NAppears in sequencesSmallest string of 1's and 0's which is prime in every base from 2 to n.at n=4A086884Smallest string of 1's and 0's which is prime in every base from 2 to n.at n=5A086884a(n) is the least number that is prime when interpreted in bases 2 to n, but not n+1.at n=5A360494