5968873

Appears in sequences

• Carmichael numbers C such that C-1 is not a Niven/Harshad number.at n=18A097061
• Alternating sum of the squares of the first n Jacobsthal numbers.at n=13A138238
• Numbers k having at least one prime factor p such that p^2 divides 2^(k-1) - 1.at n=16A291194
• Primary Carmichael numbers.at n=14A324316
• Numbers k such that gcd(k^2, 2^(k-1) - 1) > k.at n=11A331021
• Squarefree base-2 Fermat pseudoprimes divisible by a Wieferich prime.at n=2A353221
• Carmichael numbers ending in 3.at n=7A355309
• The lesser of twin Carmichael numbers: a pair of consecutive Carmichael numbers (A002997) without a non-prime-power weak Carmichael number (A087442) between them.at n=9A365022
• Starts of runs of 3 consecutive Carmichael numbers (A002997) without a non-prime-power weak Carmichael number (A087442) between any two consecutive members.at n=1A365024