3495256

Appears in sequences

• a(n) = 8/3 - 5*(-2)^n/3.at n=21A083581
• Sum_{k, k|n} 2^(k-1) + Sum_{1<=k<=n, gcd(k,n)=1} 2^(k-1).at n=21A245392
• Where 2^n appears in A340488 for the first time.at n=11A340498