476971

Appears in sequences

• Strong pseudoprimes to base 2.at n=30A001262
• Strong pseudoprimes (base-2) equal to product of 3 primes not necessarily distinct.at n=6A112450
• Pseudoprimes to base 2 of the form 4k+3.at n=24A177884
• Composite numbers n such that n == 3 (mod 8) and 2^((n-1)/2) == -1 (mod n).at n=0A244628
• Composite numbers k == 3 (mod 4) such that (1 + i)^k == 1 - i (mod k), where i = sqrt(-1).at n=5A270697
• The "non-residue" pseudoprimes: odd composite numbers n such that b(n)^((n-1)/2) == -1 (mod n), where base b(n) = A020649(n).at n=12A307767
• Odd composite numbers k such that 2^((k-1)/2) == -1 (mod k).at n=9A356638