81931

Properties

Appears in sequences

• Primes which yield a prime whenever a 1 is inserted anywhere in them (including at the beginning or end).at n=31A069246
• Primes p such that (p reversed) +6 is a square.at n=27A167472
• Primes in A002049.at n=23A185846
• Lexicographically earliest permutation of the primes such that successive absolute differences yield a permutation of all nonprime numbers.at n=33A203985
• Smallest k such that (10^n+k, 10^n+k+2) and (10^(n+1)+k, 10^(n+1)+k+2) are two pairs of twin primes with k(n+1) > k(n).at n=11A224846
• Numbers that are both prime-indexed primes and lucky-indexed lucky numbers.at n=26A307008
• Prime numbersat n=8011