200713domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that remain prime through 4 iterations of function f(x) = 10x + 3.at n=30A023328Primes that remain prime through 5 iterations of the function f(x) = 10x + 3.at n=3A023356Number of strings of numbers x(i=1..7) in 0..n with sum i^4*x(i) equal to 2401*n.at n=26A184353Prime numbersat n=18039