131141

Appears in sequences

• Positive integers with the same number of 1s in base 10 and base 2.at n=31A153115
• Numbers n such that n'' = n'+1 where n' and n'' are respectively the first and the second arithmetic derivative of n (A003415).at n=28A189639
• Numbers k for which sigma(k) = k + k'', where k'' is the second derivative of k (A068346).at n=29A348426