22847

Appears in sequences

• Lucas-Carmichael numbers: squarefree composite numbers k such that p | k => p+1 | k+1.at n=12A006972
• Difference between the cubes and 2*tetrahedral numbers; A000578(n) - 2*A000292(n).at n=33A146298
• Lucas-Carmichael numbers with 3 prime factors.at n=10A216925
• Least Lucas-Carmichael number divisible by the n-th prime.at n=17A253597
• a(n) = least Lucas-Carmichael number which is divisible by b(n), where {b(n)} (A255602) is the list of all numbers which could be a divisor of a Lucas-Carmichael number.at n=24A253598
• Composite numbers k coprime to 13 such that k divides A006190(k-Kronecker(13,k)).at n=19A327653
• a(n) is the index of the smallest square pyramidal number divisible by exactly n square pyramidal numbers.at n=19A359095
• Composite integers k such that sigma(k) | (k + 1)*tau(k) where tau is number of divisors of k.at n=15A384493