5310721

Appears in sequences

• Carmichael numbers which are also base-2 strong pseudoprimes.at n=9A063847
• Strong pseudoprimes (base-2) equal to product of 4 primes not necessarily distinct.at n=2A112451
• Carmichael numbers divisible by a smaller Carmichael number.at n=8A214758
• Carmichael numbers (A002997) that are the sum of two squares.at n=22A265237
• Carmichael numbers k such that Euler totient function of k (phi(k)) is a perfect square.at n=10A272798
• Carmichael numbers (A002997) that are central polygonal numbers (A002061).at n=0A303791
• Carmichael numbers k for which the 2-adic valuation of phi(k) does not exceed the 2-adic valuation of k-1.at n=4A339818
• Smallest Carmichael number (A002997) with n prime factors that is also a strong pseudoprime to base 2 (A001262).at n=1A356866
• 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=10A367320