5173601

Appears in sequences

• Strong pseudoprimes to bases 2 and 3.at n=5A072276
• Overpseudoprimes to bases 2 and 3.at n=0A140658
• Lesser of overpseudo-twin-primes to base 2 defined in Comment.at n=13A195468
• Strong pseudoprimes to base 3 of the form 6*k-1.at n=17A215565
• Strong pseudoprimes (base 2) that become prime when two is added.at n=7A230484
• Strong pseudoprimes k to base 2 such that either k-2 or k+2 is prime.at n=27A230487
• a(n) is the smallest odd composite k such that prime(n)^((k-1)/2) == -1 (mod k) and b^((k-1)/2) == 1 (mod k) for every natural b < prime(n).at n=1A309284
• Fermat pseudoprimes to base 2 that are tetradecagonal.at n=12A322123