278543

Properties

Appears in sequences

• Primes with a twin Carmichael number: primes p such that p-2 or p+2 are Carmichael numbers.at n=11A135437
• Numbers k such that at least one of k and k+2 is composite, while for every b coprime to k*(k+2), b^(k-1) == 1 (mod k) and b^(k+1) == 1 (mod k+2).at n=11A194231
• Primes p such that p + 2 is a Carmichael number (A002997).at n=9A272754
• Primes p such that 2*p^2 - 7, 2*p^2 - 1, and 2*p^2 + 3 are prime.at n=33A356510
• Prime numbersat n=24319