1441091

Appears in sequences

• Pseudoprimes whose prime factors do not divide any smaller pseudoprime.at n=30A084653
• Pseudoprimes to base 2 of the form 4k+3.at n=42A177884
• Composite numbers m such that (4^m - 2^m + 8*m^2 - 2) / (2*m*(2*m + 1)) is an integer.at n=18A235540
• Composite numbers n such that n == 3 (mod 8) and 2^((n-1)/2) == -1 (mod n).at n=5A244628
• Composite numbers k == 3 (mod 4) such that (1 + i)^k == 1 - i (mod k), where i = sqrt(-1).at n=13A270697
• 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=28A307767
• Lucasian pseudoprimes: composite numbers k such that 2^(k-1) == k+1 (mod k(2k+1)).at n=3A343679
• Odd composite numbers k such that 2^((k-1)/2) == -1 (mod k).at n=21A356638