145794

Appears in sequences

• Numbers k such that sigma(phi(k)) = phi(sigma(k)).at n=28A033632
• Numbers k such that phi(2*sigma(k)) = 2*sigma(phi(k)).at n=32A067709
• Numbers k such that sigma(phi(k)) == phi(sigma(k)) (mod k), that is, A033632(k)/k is an integer.at n=30A092584
• Number of (n+2)X(1+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 1 2 or 4.at n=9A252058