140759domain: NPropertiesPrimalityPrimeyesAppears in sequencesFrom George Gilbert's marks problem: jumping 5 marks at a time (initial positions).at n=17A019993Numbers m such that m-2, m-1, m+1, m+2 cannot all be represented in the form x*y + x + y for values x, y with x >= y > 1.at n=24A256386Prime numbersat n=13076