196093

Appears in sequences

• Strong pseudoprimes to base 2.at n=18A001262
• Strong pseudoprimes to base 34.at n=35A020260
• Strong pseudoprimes to base 73.at n=34A020299
• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 32.at n=23A031620
• Composite integers k such that 2^k == 2 (mod k*(k+1)).at n=26A217465
• Composite numbers k congruent to 5 (mod 8) such that 2^((k-1)/2) mod k = k-1.at n=6A244626
• 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=8A307767
• Fermat pseudoprimes to base 2 that are octadecagonal.at n=4A322160
• Odd composite numbers k such that 2^((k-1)/2) == -1 (mod k).at n=6A356638