299777domain: NPropertiesPrimalityPrimeyesAppears in sequencesOdd numbers which take a record number of steps to reach {1, 9, or 33} under iteration of the map described in the comments section of A135730.at n=39A261674Primes of the form 299...977...7 with at least one 9 and one 7.at n=0A283209Prime numbersat n=25982