124759domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that sigma(p+1) = sigma(p-1).at n=5A067891Duplicate of A067891.at n=5A068357Smallest prime factor of A104357(n) = A104350(n) - 1.at n=26A104358a(n) = number of segments (edges) in the configuration A290447(n).at n=37A290866Prime numbersat n=11714