118213domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumbers k such that 221*2^k+1 is prime.at n=39A032487Primes with 4 distinct digits that remain prime (no leading zeros allowed) after deleting all occurrences of its digits d.at n=26A057880Prime terms of A000328.at n=43A381017Prime numbersat n=11151