361364501domain: NPropertiesPrimalityPrimeyesAppears in sequencesExpansion of 1/(1 - x^3/(1-x)^7).at n=21A369806Expansion of 1/(1 - x^3*(1 + x)^4).at n=36A375318a(n) = Sum_{k=0..floor(2*n/7)} binomial(2*n-4*k,3*k).at n=24A392403Prime numbersat n=19380310