75381

Appears in sequences

• n written in fractional base 9/7.at n=46A024655
• a(1) = 2, a(n+1) = a(n)-th squarefree number > 1.at n=22A071255
• Numbers n such that 9*10^n + 7*R_n - 4 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=14A103106
• Number of n-bead necklaces labeled with numbers -4..4 not allowing reversal, with sum zero and first and second differences in -4..4.at n=9A209003