264221domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumerators of the squarefree totient analogs of the harmonic numbers F_n.at n=30A138316Numerators of the squarefree totient analogs of the harmonic numbers F_n.at n=31A138316Primes of the form 2^x+x+y+2^y, with x and y integers of any sign.at n=22A162574Prime numbersat n=23170