2004403

Appears in sequences

• Composite numbers n such that n == 3 (mod 8) and 2^((n-1)/2) == -1 (mod n).at n=9A244628
• Composite numbers k == 3 (mod 4) such that (1 + i)^k == 1 - i (mod k), where i = sqrt(-1).at n=17A270697
• Odd composite numbers k such that 2^((k-1)/2) == -1 (mod k).at n=29A356638