140130

Appears in sequences

• Numbers k such that sigma(phi(k)) = phi(sigma(k)).at n=26A033632
• Numbers k such that phi(2*sigma(k)) = 2*sigma(phi(k)).at n=31A067709
• Numbers k such that sigma(phi(k)) == phi(sigma(k)) (mod k), that is, A033632(k)/k is an integer.at n=28A092584