82513

Appears in sequences

• Strong pseudoprimes to base 3.at n=19A020229
• Strong pseudoprimes to base 23.at n=26A020249
• Strong pseudoprimes to base 28.at n=22A020254
• Strong pseudoprimes to base 55.at n=23A020281
• Strong pseudoprimes to base 67.at n=25A020293
• Strong pseudoprimes to base 69.at n=30A020295
• Strong pseudoprimes to base 83.at n=23A020309
• Strong pseudoprimes to base 84.at n=23A020310
• Base-3 Euler-Jacobi pseudoprimes.at n=34A048950
• The "residue" pseudoprimes: odd composite numbers n such that q(n)^((n-1)/2) == 1 (mod n), where base q(n) is the smallest prime quadratic residue modulo n.at n=38A307798
• Super pseudoprimes (or superpseudoprimes) to base 3: Fermat pseudoprimes to base 3 all of whose divisors that are larger than 1 are either primes or Fermat pseudoprimes to base 3.at n=34A328662
• Composite numbers k such that (1 - w)^(k-1) == 1 (mod k) in the ring of Eisenstein integers (w = (-1 + sqrt(3)*i)/2).at n=33A329705
• Numbers k such that there exists i >= 1 such that k divides 3^3^i - 1.at n=27A367265
• Composite numbers k == 1, 11 (mod 12) such that 3^((k-1)/2) == 1 (mod k).at n=25A375917
• G.f.: 1/Product_{k>=1} (1 - x^(2*k^2)) * (1 - x^k).at n=37A385011