69559domain: NAppears in sequencesResidues of the Lucas - Lehmer primality test for M(17) = 131071.at n=11A129222Sum of all parts minus the total numbers of parts of all partitions of n.at n=27A196087Let p = n-th prime == 3 mod 8; a(n) = sum of quadratic nonresidues mod p .at n=25A282726