675405

Appears in sequences

• a(1)=3; a(n)=first odd number greater than a(n-1) such that 2*a(n)-1 is prime and a(i)+a(n)-1 is prime for all 1<=i<=n-1.at n=8A120403
• Number of 0..n arrays of length 5 with each element differing from at least one neighbor by 2 or more, starting with 0.at n=28A221516