80779domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that remain prime through 4 iterations of function f(x) = 2x + 5.at n=31A023304McKay-Thompson series of class 28D for Monster.at n=42A058609Engel expansion of sqrt(10) = 3.16227...at n=17A059177Prime numbersat n=7906