399996domain: NAppears in sequencesNumbers n such that 2n+1 is the digit reversal of n+1.at n=4A083811a(n) = 4*(10^n - 1).at n=5A086575Where records occur in A119451.at n=25A119453Numbers which can be expressed as the product of numbers made of only sixs.at n=27A161144Indices of records in A004290.at n=25A268610