287274

Appears in sequences

• Quasi-Carmichael numbers to base -6: squarefree composites n such that prime p|n ==> p+6|n+6.at n=1A029566
• a(n) = smallest k having at least five prime divisors d such that (d + n) | (k + n).at n=5A202160
• Even Quasi-Carmichael numbers.at n=15A262252