2433601

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=21A033181
• Carmichael numbers with exactly 4 prime factors.at n=25A074379
• Smaller sides (a) in (a,a,a+1)-integer triangle with integer area.at n=6A103974
• a(n) = 3*a(n-1) + 3*a(n-2) - a(n-3); a(0)=1, a(1)=1, a(2)=5.at n=12A120893
• a(n) is the smallest Carmichael number (A002997) divisible by the n-th prime, or 0 if no such number exists.at n=14A135721
• Carmichael numbers with more than 3 prime factors.at n=27A141711
• Carmichael numbers of the form C = 37*73*(18n+91).at n=3A182206
• Hypotenuses of Pythagorean triples in A195499 and A195503.at n=10A195531
• Fermat pseudoprimes to base 2 of the form (p^2 + 2*p)/3, where p is also a Fermat pseudoprime to base 2.at n=2A216276
• Least Carmichael number that is divisible by the n-th cyclic number A003277(n), or 0 if no such number exists.at n=18A253595
• Carmichael numbers whose prime factors all have the form p=1+x^2+y^2 for some x,y in Z.at n=5A258839
• Carmichael numbers (A002997) that are the sum of two squares.at n=17A265237
• Carmichael numbers (A002997) k such that k-1 is a square.at n=1A265285
• Carmichael numbers (A002997) k such that k-1 is a perfect power (A001597).at n=2A265328
• Numbers d > 1 such that the class number of Q(sqrt(d)) is strictly greater than the class number of Q(sqrt(m)) for all m < d.at n=34A283658
• Numbers n > 2 such that A258409(n)*A002322(n) divides n-1.at n=8A284671
• Markoff spectrum N^(2)(Lambda).at n=24A293174
• Carmichael numbers ending in 1.at n=35A354609
• Smallest Euler-Jacobi pseudoprime to all natural bases up to prime(n) - 1 that is not a base prime(n) Euler-Jacobi pseudoprime.at n=6A354692
• Carmichael numbers k such that k-1 is a Novak-Carmichael number.at n=10A375322