131140

Appears in sequences

• Positive integers with the same number of 1s in base 10 and base 2.at n=30A153115
• a(n) = Sum_{d|n} d*2^(n/d)*tau(d).at n=16A174478
• Number of (not necessarily maximal) cliques in the n-sun graph.at n=16A295904
• Numbers k for which A019565(2k)-1 is a multiple of A000265(phi(A019565(2k))).at n=39A339973
• a(n) = Sum_{k=0..n} binomial(n,k) * binomial(n+3*k,n-k).at n=7A378404