1773289

Appears in sequences

• Absolute Euler pseudoprimes: odd composite numbers n such that a^((n-1)/2) == +-1 (mod n) for every a coprime to n.at n=18A033181
• Carmichael numbers with exactly 4 prime factors.at n=22A074379
• Carmichael numbers with more than 3 prime factors.at n=24A141711
• Carmichael numbers of the form C = (30n-p)*(60n-(2p+1))*(90n-(3p+2)), where n is a natural number and p, 2p+1, 3p+2 are all three prime numbers.at n=3A182087
• Carmichael numbers divisible by 7.at n=19A182208
• Carmichael numbers divisible by a smaller Carmichael number.at n=7A214758
• Carmichael numbers of the form (6*k+1)*(12*k+1)*(18*k+1) which are the product of four prime numbers.at n=1A221742
• Carmichael numbers of the form (6*k + 1)*(12*k + 1)*(18*k + 1), where only two of the three numbers 6*k + 1, 12*k + 1, 18*k + 1 are prime.at n=1A242980
• Carmichael numbers k such that Euler totient function of k (phi(k)) is a perfect square.at n=8A272798
• Carmichael numbers all of whose prime factors are congruent to 3 modulo 4.at n=3A329468
• Carmichael numbers ending in 9.at n=4A352970
• Carmichael numbers k such that (k-1)/lambda(k) > (m-1)/lambda(m) for all Carmichael numbers m < k, where lambda is the Carmichael lambda function (A002322).at n=9A367320
• Carmichael numbers that are the sum of 2 positive cubes.at n=6A379656
• a(n) = (6*n + 1)*(12*n + 1)*(18*n + 1).at n=11A382809