59591domain: NAppears in sequencesConvolution of A073709, which is also the first differences of the unique terms of A073709.at n=18A073710Semiprimes formed by concatenating n, n, and 1 for n = 1, 2, 3,....at n=25A210711Number of partitions of n with up to four distinct kinds of 1.at n=39A320691