5444489

Appears in sequences

• Carmichael numbers which are also base-2 strong pseudoprimes.at n=10A063847
• Carmichael numbers C such that C-1 is not a Niven/Harshad number.at n=15A097061
• Carmichael numbers that are not == 1 mod 24.at n=23A097130
• Carmichael numbers that are not == 1 mod 12. There are 69 Carmichael numbers out to 2*m+1, m=2*10^6 and all but the above 9 are 1 mod 12.at n=9A110889
• Strong pseudoprimes (base-2) equal to product of 3 primes not necessarily distinct.at n=18A112450
• a(n) is the largest Carmichael number of the form prime(n)*prime(n')*prime(n") with n < n' < n", or 0 if no such number exists.at n=9A141706
• Carmichael numbers not congruent to 1 modulo 6.at n=6A205947
• Composite numbers n such that gcd(phi(n), n-1) = lambda(n), where lambda(n) = A002322(n).at n=30A264012
• Carmichael numbers (A002997) that are the sum of two squares.at n=23A265237
• The largest 3-Carmichael number that is divisible by the n-th odd prime.at n=8A290485
• Fermat pseudoprimes to base 2 that are tetradecagonal.at n=13A322123
• Carmichael numbers ending in 9.at n=5A352970