663600domain: NAppears in sequencesNumbers k such that k and k^2 use only the digits 0, 3, 4, 6 and 9.at n=49A136932Numbers k such that k+1 is a prime, k+2 is twice a prime, k+3 is three times a prime, and k+4 is four times a prime.at n=25A278585a(n) = 25*(n + 1)*(4*n + 3)*(5*n + 4)/3.at n=15A300254