1458270

Appears in sequences

• Numbers k such that the product of Euler phi of the 2 consecutive integers {k,k+1} is a 4th power: if sqrt(sqrt(phi(k)*phi(k+1))) is an integer, then k is here.at n=34A082788
• Numbers k such that phi(k+1) = 4*phi(k).at n=15A172314