# code: http://golf.shinh.org/reveal.rb?A006520/tails_1644934146&nbb
# target Nibbles version: 0.23
# commenter version: 0.1.2.181

=\ #(scanl1):[int] 
    , #(range from 1):[int] 
        500 #(integer):int 
    + #(add):int <--arg( B:int A:int ) 
        @ #(= A):int 
        `& #(bit intersection):int 
            $ #(= B):int 
            * #(multiply):int 
                ~ #(auto = -1):auto 
                #(implicit arg = B):int