8689997domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes from merging of 7 successive digits in decimal expansion of sqrt(2).at n=21A198167For n >= 2, a(n) = a(n-1) + a(n-2) + A051697(n), a(0)=0, a(1)=1.at n=31A363707Prime numbersat n=583086