3668869domain: NPropertiesPrimalityPrimeyesAppears in sequencesSequence defined by the recurrence formula a(n+1)=sum(a(p)*a(n-p)+k,p=0..n)+l for n>=1, with here a(0)=1, a(1)=8, k=-1 and l=1.at n=9A177199Prime numbersat n=261291