2900209domain: NAppears in sequencesNumbers k that divide 10^k + 3^k.at n=15A045589Squares composed of digits {0,2,9}, not ending with zero.at n=4A058428Number of n X 4 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 1 vertically.at n=23A207364