139952671

Appears in sequences

• Carmichael numbers that are not == 1 mod 12. There are 69 Carmichael numbers out to 2*m+1, m=2*10^6 and all but the above 9 are 1 mod 12.at n=20A110889
• Carmichael numbers congruent to 3 modulo 4.at n=8A185321
• Numbers of the form 4k+3 (A004767) that are Lucas pseudoprimes and Fermat pseudoprimes to base 2 (intersection of A005845 and A001567).at n=5A227905
• Carmichael numbers k such that k-1 is squarefree.at n=0A257643
• Carmichael numbers that are not of the form x^2 + y^2 + z^2 where x, y and z are integers.at n=6A267462
• Numbers k such that (k-1) mod phi(k) = lambda(k), where phi = A000010 and lambda = A002322.at n=4A290281
• The least 3-Carmichael number that is divisible by the n-th odd prime, or 0 if no such number exists.at n=30A290486
• Carmichael numbers that are products of primes p for which each p-1 is squarefree.at n=3A328939
• Carmichael numbers all of whose prime factors are congruent to 3 modulo 4.at n=23A329468
• 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=14A329799
• 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=14A382791