57405

Appears in sequences

• Quasi-Carmichael numbers to base -3: squarefree composites n such that for every prime p that divides n, p+3 divides n+3.at n=10A029563
• Number of subgroups of the group C_n X C_n X C_n (where C_n is the cyclic group of order n).at n=35A064803
• Index of first occurrence of -n in A000319, or -1 if -n never appears there.at n=49A381231