13050503domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of permutations p of 1..n with sum (i-p(i))^2 <= (n+1)*n/2.at n=13A179264Number of permutations p of 1..n with sum (i-p(i))^2 < (n+1)*n/2.at n=13A179266Prime numbersat n=852317