133141

Appears in sequences

• Strong pseudoprimes to base 5.at n=21A020231
• Strong pseudoprimes to base 21.at n=32A020247
• Strong pseudoprimes to base 28.at n=29A020254
• Strong pseudoprimes to base 34.at n=28A020260
• Strong pseudoprimes to base 38.at n=37A020264
• Strong pseudoprimes to base 43.at n=32A020269
• Strong pseudoprimes to base 74.at n=33A020300
• Strong pseudoprimes to base 82.at n=38A020308
• Strong pseudoprimes to base 83.at n=30A020309
• Lucky numbers that are decimal concatenations of n with n + 8.at n=6A032658
• Overpseudoprimes to base 5.at n=12A141390
• Odd octagonal numbers indexed by triangular numbers.at n=14A243201
• Octagonal numbers (A000567) that are semiprimes (A001358).at n=22A259677
• Base-5 Euler-Jacobi pseudoprimes: odd composite k coprime to 5 such that 5^((k-1)/2) == (5/k) (mod n), where (5/k) is the Jacobi symbol (or Kronecker symbol).at n=37A375914
• Composite numbers k == 1, 9 (mod 10) such that 5^((k-1)/2) == 1 (mod k).at n=35A375915