211261domain: NAppears in sequencesIndices of primes in sequence defined by A(0) = 11, A(n) = 10*A(n-1) + 41 for n > 0.at n=9A056246Number of distinct solutions of sum{i=1..4}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 1..n-1.at n=13A180786