145888

Appears in sequences

• Numbers k such that sigma(k) = 3k - 2*phi(k).at n=12A068414
• Composite numbers k such that k - phi(k) divides sigma(k) - k.at n=20A068418
• Composite n such that n reduced mod(phi(n)) = sigma(n) reduced mod(n).at n=19A068495
• Number of n X 2 0..1 arrays with every element both equal and not equal to some elements at offset (-1,0) (-1,1) (0,-1) (0,1) (1,-1) or (1,0), with upper left element zero.at n=11A278171