85877domain: NAppears in sequencesQuasi-Carmichael numbers to base 8: squarefree composites n such that (n,2*3*5*7) = 1 and prime p|n ==> p-8|n-8.at n=4A029555Composite squarefree numbers n such that p-d(n) divides n-d(n), where p are the prime factors of n and d(n) the number of divisors of n.at n=28A228300