162401

Appears in sequences

• Carmichael numbers: composite numbers k such that a^(k-1) == 1 (mod k) for every a coprime to k.at n=19A002997
• Strong pseudoprimes to base 53.at n=33A020279
• Strong pseudoprimes to base 94.at n=32A020320
• Absolute Euler pseudoprimes: odd composite numbers n such that a^((n-1)/2) == +-1 (mod n) for every a coprime to n.at n=6A033181
• Numbers whose base-11 representation has exactly 6 runs.at n=7A043649
• Pseudoprimes to both base 2 and base 3, i.e., intersection of A001567 and A005935.at n=28A052155
• Pseudoprimes to bases 2 and 5.at n=21A083732
• Pseudoprimes to bases 2 and 7.at n=13A083733
• Pseudoprimes to bases 3 and 5.at n=19A083734
• Pseudoprimes to bases 3 and 7.at n=16A083735
• Pseudoprimes to bases 2,5 and 7.at n=5A083736
• Pseudoprimes to bases 2, 3 and 5.at n=14A083737
• Pseudoprimes to bases 2,3 and 7.at n=9A083738
• Pseudoprimes to bases 2, 3, 5 and 7.at n=4A083739
• Pseudoprimes to bases 3,5 and 7.at n=6A083740
• Least pseudoprime to base 2 through base prime(n).at n=5A083876
• 3-Carmichael numbers: Carmichael numbers equal to the product of 3 primes: k = p*q*r, where p < q < r are primes such that a^(k-1) == 1 (mod k) if a is prime to k.at n=13A087788
• Carmichael numbers C such that C-1 is not a Niven/Harshad number.at n=3A097061
• Carmichael numbers that are not == 1 mod 24.at n=8A097130
• Records in A098650.at n=8A098652