451439domain: NPropertiesPrimalityPrimeyesAppears in sequencesStarting positions of strings of four 4's in the decimal expansion of Pi.at n=29A083616a(n) is the least prime p such that there are exactly n primes of the form p+d where d is a divisor of p-1 or of p+1.at n=37A340160Prime numbersat n=37828