126613domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of 4-ary search trees on n keys.at n=15A019498Concatenation of n in base 2 up to base 10 and n in base 10 down to base 2 is prime, all numbers are interpreted as decimals.at n=20A054258Primes that are the sum of 101 consecutive primes.at n=18A215993Prime numbersat n=11873