77143domain: NAppears in sequencesNumbers k with property that p = 10k + 1, p^3 + 6, p^3 + 12 and p^3 + 18 are all prime.at n=6A173629Expansion of Product_{k>=1} (1 + x^(k*(k+1)/2))^(k*(k+1)/2).at n=48A298850