673663

Appears in sequences

• Odd integers n such that 2^n == 16 (mod n).at n=3A033984
• Composite numbers k such that 2^(k-4) == 1 (mod k).at n=2A173138
• Odd numbers n such that 2^d(n) == 2^n (mod n) where d = A000005.at n=5A292562