35302901domain: NPropertiesPrimalityPrimeyesAppears in sequences"Self-Lucas"; a(n) is the sum of the last 5 terms. Sequence starts with 12,21,3,1,19 which are l,u,c,a,s if you consider a=1, b=2, c=3, ..., z=26.at n=25A129939Prime numbersat n=2164163