77777747domain: NPropertiesPrimalityPrimeyesAppears in sequencesLargest base 10 near-repdigit (all but one digit alike) prime with digit n repeated n times (or 0, if no such prime exists).at n=6A160369Primes with exactly seven 7's.at n=3A178556Largest n-digit prime having at least n-1 digits equal to 7.at n=7A268706Prime numbersat n=4547302