87011

Properties

Appears in sequences

• Number of ways to cover (without overlapping) a ring lattice (necklace) of n sites with molecules that are 7 sites wide.at n=49A058366
• a(n) = (3*9^n - 5^n)/2.at n=5A165149
• Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum prime and every diagonal and antidiagonal sum nonprime.at n=4A251942
• Number of (n+2)X(5+2) 0..3 arrays with every 3X3 subblock row and column sum prime and every diagonal and antidiagonal sum nonprime.at n=4A251947
• Lesser of twin primes for which phi(p-1) < phi(p+1).at n=20A286715
• Primes which yield again a prime when the digits are taken according to the lexicographically first superpermutation of corresponding order and of minimal length.at n=48A332088
• Prime numbersat n=8451