117981domain: NAppears in sequencesPartial sums of A005109.at n=29A172167Least number x such that x^n has n digits equal to k. Case k=4.at n=37A285451Number of 3 X n 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=9A302324