470471domain: NPropertiesPrimalityPrimeyesAppears in sequencesLesser of twin primes p >= 5 for which phi(p+1)/phi(p-1) reaches record value, where phi(n) is the Euler totient function (A000010).at n=7A326356Primes formed by the concatenation of exactly two consecutive composite numbers.at n=35A342049Prime numbersat n=39265