Sum of even composites up to n is palindromic.

Terms

a(0) =4a(1) =18a(2) =58a(3) =134a(4) =178a(5) =424a(6) =598a(7) =1344a(8) =4254a(9) =5998a(10) =57630a(11) =58740a(12) =59998a(13) =127404a(14) =424414a(15) =425344a(16) =599998a(17) =1273554a(18) =4244414a(19) =5722840a(20) =5999998a(21) =18886848a(22) =42683384a(23) =57725768a(24) =59999998a(25) =424650414a(26) =578107368a(27) =588254658a(28) =588349340