701709

Appears in sequences

• Concatenations of pairs of primes that differ by 8.at n=30A104718
• a(n) = 3*a(n-1)-4*a(n-3)+a(n-4)+a(n-5)+3*a(n-6)-a(n-7) for n >= 8, with initial values as shown.at n=15A238823