21928717

Appears in sequences

• Quasi-Carmichael numbers to base -8: squarefree composites n such that prime p|n ==> p+8|n+8.at n=15A029568
• Composite 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=17A228299