174566

Appears in sequences

• a(n) = Sum_{ i=2..n-1, j=1..i-1, gcd(i,j)=1 } (n-i)*(n-j).at n=38A332612
• a(0) = 0; for n>0, a(n) is the index of the last term in A109812 that is <= 2^n - 1.at n=15A352205
• Indices k where k/A109812(k) reaches a new high point.at n=12A352919