71897239domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of (n+1) X 3 0..2 arrays with each element of every 2 X 2 subblock being the sum mod 3 of two others.at n=7A183829Number of (n+1)X9 0..2 arrays with each element of every 2X2 subblock being the sum mod 3 of two others.at n=1A183835Prime numbersat n=4222990