686059921

Appears in sequences

• Carmichael numbers that only have composite XOR couples as defined in A182108.at n=21A182116
• Carmichael numbers k that satisfy 2^d == 2^(k/d) (mod k) for all d|k and are not Super-Poulet numbers (A050217).at n=9A291612
• Carmichael numbers k such that 2^d == 2^(k/d) (mod k) for all d|k.at n=10A291616
• a(n) is the smallest Carmichael number k such that gpf(p-1) = prime(n) for all prime factors p of k.at n=10A327787