343027

Appears in sequences

• Quasi-Carmichael numbers to base -8: squarefree composites n such that prime p|n ==> p+8|n+8.at n=0A029568
• For n>0, a(n) is the least quasi-Carmichael number to base -n, extended to n=0 with the least composite squarefree integer.at n=8A029591
• 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=2A228299
• Quasi-Carmichael numbers to at least one negative base and at least one positive base.at n=32A257759
• Squarefree terms of A372894 whose prime factors are neither elite (A102742) nor anti-elite (A128852).at n=37A372896