155819
domain: N
Appears in sequences
- Lucas-Carmichael numbers: squarefree composite numbers k such that p | k => p+1 | k+1.at n=31A006972
- Lucas-Carmichael numbers with 3 prime factors.at n=22A216925
- Strong Lucas pseudoprimes.at n=16A217255
- Extra strong Lucas pseudoprimes.at n=18A217719
- Composite numbers k such that Pell(k) == -1 (mod k).at n=12A319043
- Number of nonnegative solutions to (x_1)^2 + (x_2)^2 + ... + (x_9)^2 <= n.at n=29A341404