1005710domain: NAppears in sequences1/4 the number of arrangements of 6 nonzero numbers x(i) in -n..n with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero.at n=9A189955Nonprimes such that it takes exactly 5 iterations of reverse-and-add digits to generate a prime.at n=5A245210