234374

Appears in sequences

• Let m = n-th squarefree number = A005117(n), and consider the smallest pair of consecutive squarefree numbers (r,s) with gcd(r,s) = m; sequence gives values of r.at n=5A109473
• Consider the smallest pair of consecutive squarefree numbers (r,s) with gcd(r,s) = n; sequence gives values of r, or -1 if n is not squarefree.at n=6A109505
• Numbers of the form i*5^j-1 (i=1..4, j >= 0).at n=30A181287
• a(n) = 3*5^n - 1 = 2*A057651(n).at n=7A198762
• Number of nonintersecting (or self-avoiding) rook paths joining opposite corners of an n X n grid that move in 3 or fewer cardinal directions.at n=6A265132