29111881

Appears in sequences

• Carmichael numbers which are also base-2 strong pseudoprimes.at n=12A063847
• Carmichael numbers that have only prime divisors of the form 10k+1.at n=22A212843
• a(1) = 561; a(n+1) = smallest Fermat pseudoprime to all natural bases up to lpf(a(n)).at n=12A300629
• Primary Carmichael numbers.at n=31A324316
• Records in A083876.at n=12A348258
• Composites that cause a witness to be added to a set of Fermat witnesses: a(n) is the smallest composite number that is not guaranteed composite using Fermat's Little Theorem by the witness A380978(i) for any i < n.at n=25A380979