974863domain: NPropertiesPrimalityPrimeyesAppears in sequencesTriangle T(n,k) read by rows: the coefficient [x^k] of the series (1-x)^(2n-1)*Sum_{l>=0} A001263(n+3*l,3*l+1)*x^l, in row n>=1 with exponents k>=0.at n=26A178658Prime numbersat n=76711