458989

Appears in sequences

• Strong pseudoprimes to base 2.at n=29A001262
• Sarrus numbers k such that k-1 and k+1 have the same number of prime divisors (counted with multiplicity).at n=8A086806
• Overpseudoprimes to base 2: composite k such that k = A137576((k-1)/2).at n=15A141232
• Strong pseudoprimes (base 2) that become prime when two is subtracted.at n=8A230483
• Strong pseudoprimes k to base 2 such that either k-2 or k+2 is prime.at n=10A230487
• Composite numbers k congruent to 5 (mod 8) such that 2^((k-1)/2) mod k = k-1.at n=8A244626
• 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=11A307767
• Fermat pseudoprimes to base 2 that are tetradecagonal.at n=2A322123
• Odd composite numbers k such that 2^((k-1)/2) == -1 (mod k).at n=8A356638