171146domain: NAppears in sequencesIccanobirt numbers (14 of 15): a(n) = R(R(a(n-1)) + R(a(n-2)) + a(n-3)), where R is the digit reversal function A004086.at n=24A102124Conjectured largest number having n representations as the sum of two twin primes p + q with p >= q.at n=9A212613