311313

Appears in sequences

• Juxtapose pairs of primes (starting at 1).at n=32A007794
• Twin prime pairs concatenated in decimal representation.at n=19A095958
• a(1) = 1; thereafter a(n) is always the smallest integer > a(n-1) not leading to a contradiction, such that the concatenation of any three consecutive digits in the sequence is a prime.at n=25A152608
• List of words over {1,3} with equal numbers of 1's and 3's.at n=19A214488