774885169domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumerator of Sum_{k=0..n} 1/binomial(n,k).at n=26A046825Numerator of (1/n)*Sum_{k=0..n-1} 1/binomial(n-1,k) for n>0 else 0.at n=27A046878Largest prime dividing Sum_{k=0..n} k! * (n-k)!.at n=25A049413Numerators of b(n) = b(n-1)/2 + 1/(2*n), b(0)=0.at n=27A242376Prime numbersat n=39919749