229233

Appears in sequences

• Juxtapose pairs of primes (starting at 1).at n=25A007794
• Concatenations of pairs of primes that differ by four.at n=15A103195
• a(n) = number of steps to reach (3^n)-1 when starting from k = (3^(n+1))-1 and repeatedly applying the map that replaces k with k - (sum of digits in base-3 representation of k).at n=13A261234