109503domain: NAppears in sequencesSmallest powerful number (definition 1) such that a(n)+n is also powerful.at n=57A076444a(n) = 9*n^3.at n=23A244728Number of Carlitz compositions of n that either have length 1, or have length greater than or equal to 2 and are palindromic if we exclude the first part.at n=39A291941