1294139domain: NAppears in sequencesNumbers of the form 7^i*11^j.at n=28A003599Numbers k such that k | 5^k + 4^k + 3^k + 2^k.at n=35A057249Numbers n such that n | 13^n + 11^n + 9^n + 7^n + 5^n + 3^n +1.at n=16A057833Numbers which can be expressed as the product of numbers made of only sevens.at n=31A161145