789507domain: NAppears in sequencesPseudo-powers to base 3: numbers k that are not powers of 3 such that k divides 2^k + 1.at n=25A016057Numbers with prime signature {7,2}, i.e., of form p^7*q^2 with p and q distinct primes.at n=28A179689Terms k of A006521 such that 2*k is a term of A124240.at n=35A289257