526557domain: NAppears in sequencesa(n) = -2*a(n-1) + a(n-2) + a(n-3), a(0) = -1, a(1) = -4, a(2) = 5.at n=16A32117410^n + a(n) is the smallest (n+1)-digit initial member of a prime sextuplet, or a(n) = 0 if no such number exists.at n=7A343636