333787domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumerator of Sum_{i=1..n} i!/(i^i).at n=5A121563Primes p such that 24*p-1, 24*p+1 and 30*p-1, 30*p+1 are twin primes.at n=21A138695Numerators of the partial sums of the reciprocals of the alternating sum of divisors function (A206369).at n=28A379619Prime numbersat n=28705