153851

Appears in sequences

• Numbers k such that Euler phi(k) / Carmichael lambda(k) = 34.at n=31A066698
• Numbers k such that sigma(phi(sigma(k))) = phi(sigma(phi(k))).at n=30A067160
• Composite solutions of the form 4k+3 of the equation (*): sigma(phi(sigma(x)))=phi(sigma(phi(x))).at n=7A112017
• Number of nX3 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero.at n=12A298391