535444domain: NAppears in sequencesa(n) = (1/24)*(n+1)*(n+6)*(n^3+26*n^2+225*n+636).at n=21A090948a(n) = number of 9-digit primes with digit sum n, where n runs through the non-multiples of 3 in the range [2..80].at n=15A178884