612816751

Appears in sequences

• Carmichael numbers congruent to 3 modulo 4.at n=12A185321
• Numbers of the form 4k+3 (A004767) that are Lucas pseudoprimes and Fermat pseudoprimes to base 2 (intersection of A005845 and A001567).at n=14A227905
• Carmichael numbers that are not of the form x^2 + y^2 + z^2 where x, y and z are integers.at n=8A267462
• 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=23A329799
• 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=23A382791