2215441

Appears in sequences

• Numbers k such that 2^(2^k-2) == 1 (mod k^2) and 2^(k-1) =/= 1 (mod k).at n=2A374953
• Composite numbers k such that 2^(2^(k-1)-1) == 1 (mod k^2).at n=10A376253
• Numbers k such that 2^(2^(k-1)-1) == 1 (mod k^2) and 2^(k-1) =/= 1 (mod k).at n=1A376473