133800661
domain: N
Appears in sequences
- Carmichael numbers which are also base-2 strong pseudoprimes.at n=22A063847
- Carmichael numbers that only have composite XOR couples as defined in A182108.at n=9A182116
- Strong pseudoprimes to base 2 and 5.at n=16A215568
- Imprimitive Carmichael numbers: Carmichael numbers m such that if m = p_1 * p_2 * ... *p_k is the prime factorization of m then g(m) = gcd(p_1 - 1, ..., p_k - 1) > sqrt(lambda(m)), where lambda is the Carmichael lambda function (A002322).at n=27A328935
- Odd composite numbers k such that A111076(k)^((k-1)/2) == -1 (mod k).at n=6A329538
- Odd squarefree composite numbers k such that p-1 divides k-1 and p-1 does not divide (k-1)/2 for every prime p|k.at n=13A329799
- Carmichael numbers with exactly 3 prime factors, p*q*r, such that p-1, q-1 and r-1 have an equal 2-adic valuation.at n=13A382791