390603

Appears in sequences

• Numbers k such that 1/(1/phi(k) + 1/phi(k+1) + 1/phi(k+2) + 1/phi(k+3)) is an integer.at n=27A073544
• Number of length 4 arrays x(i), i=1..4 with x(i) in i..i+n and no value appearing more than 3 times.at n=23A250362