323723domain: NAppears in sequencesNumbers k such that the sum of digits^4 of k equals Sum_{d|k, 1<d<k} d.at n=6A202147Numbers k such that sum of 4th power of digits of k equals the sum of prime divisors of k.at n=22A217532Numbers whose arithmetic derivative is equal to the sum of some fixed power of their digits.at n=23A269719