177883domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of n-ary words beginning with the first character of the alphabet, that can be built by inserting four doublets into the initially empty word.at n=24A194716Primes p for which p + 4, p^2 + 4 and p^3 + 4 are primes.at n=26A243734Prime numbersat n=16147