631071001

Appears in sequences

• Carmichael numbers that only have composite XOR couples as defined in A182108.at n=20A182116
• Numbers k such that lambda(k)^3 divides (k-1)^2, where lambda(k) = A002322(k).at n=5A277389
• Numbers k such that gcd(phi(k), k-1) > lambda(k)^2.at n=1A283872
• Numbers n with record number of primes p such that n*p is a Carmichael number.at n=11A292366
• Carmichael numbers c with record number of primes p such that c*p is also a Carmichael number.at n=8A292367