68154001

Appears in sequences

• Carmichael numbers which are also base-2 strong pseudoprimes.at n=17A063847
• Carmichael numbers of the form (6*k + 1)*(24*k + 1)*(30*k + 1).at n=1A230722
• Carmichael numbers of the form (30*k + 1)*(120*k + 1)*(150*k + 1), where 30*k + 1, 120*k + 1 and 150*k + 1 are all primes.at n=0A230746
• 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=20A328935
• Carmichael numbers k such that the multiplicative order of 2 modulo k is odd.at n=3A367231