423181

Appears in sequences

• Quasi-Carmichael numbers to base 10: squarefree composites n such that (n,2*3*5*7) = 1 and prime p|n ==> p-10|n-10.at n=3A029553
• Numbers n such that phi(sigma(n)) = sigma(n) - phi(n).at n=17A230372
• Quasi-Carmichael numbers to at least one negative base and at least one positive base.at n=34A257759