266378112domain: NAppears in sequencesNumber of n-step closed paths on hexagonal lattice.at n=13A002898There exists some k>0 such that n is the product of (k + digits of n).at n=31A055482Numbers n such that n=(d_1+5)(d_2+5)*...*(d_k+5), where d_1 d_2 ... d_k is the decimal expansion of n.at n=11A097371