84771domain: NAppears in sequencesIndices of primes in sequence defined by A(0) = 77, A(n) = 10*A(n-1) + 27 for n > 0.at n=10A056263A (4,5)-Somos 4 sequence.at n=5A174404Number of 5-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero.at n=13A208599