47609domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form 10*k^2 - 1.at n=11A143828a(1) = 1, a(2) = 2; for n >= 3, a(n) = least number not included earlier that divides the concatenation of all previous terms.at n=27A240588Prime numbersat n=4908