285119domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of 1-sided strip polykites with n cells.at n=16A151529Lesser of twin primes P(k) and P(k+1) such that Sd(P(k)) + Sd(P(k+1)) = Sd(k) + Sd(k+1), where Sd(x) is the sum of digits of x.at n=31A277111Prime numbersat n=24853