794502domain: NAppears in sequencesLeast positive number k such that k*p+1 divides 2^p+1 where p is prime(n), or 0 if no such number exists.at n=19A185343Number of 0..2 arrays x(0..n-1) of n elements with each no smaller than the sum of its four previous neighbors modulo 3.at n=18A200463