Numbers k such that 4*k = (k written backwards), k > 0.

Terms

a(0) =2178a(1) =21978a(2) =219978a(3) =2199978a(4) =21782178a(5) =21999978a(6) =217802178a(7) =219999978a(8) =2178002178a(9) =2197821978a(10) =2199999978a(11) =21780002178a(12) =21978021978a(13) =21999999978a(14) =217800002178a(15) =217821782178a(16) =219780021978a(17) =219978219978a(18) =219999999978