152959domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that 42*p-1, 42*p+1 and 48*p-1, 48*p+1 are twin primes.at n=29A138697a(n) is the first prime index where the gap between R(n), Riemann's prime counting function, and Pi(n), the exact prime counting function, is greater than n.at n=15A226473Prime numbersat n=14108