%I #18 Nov 05 2019 05:54:45
%S 4,34,36,215,258,288,1711,2785,3708,4572,4873,18986,29509,42005,45534,
%T 234272,411232,2074123,2225480,2841251,3728941,4590401,17643216,
%U 72349270,176262062,219311147,426454179,444875288,1457527586
%N Sum of composite numbers up to n is palindromic.
%C Sequence is 4 + 6 + 8 + 9 + 10 + 12 + ... + n.
%H Patrick De Geest, <a href="http://www.worldofnumbers.com/firstpal.htm#sfn3">Palindromic Sums</a>.
%H Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_089.htm">Puzzle 89</a>, The Prime Puzzles & Problems Connection.
%F a(n) = A002808(A053779(n)). - _R. J. Mathar_, Sep 09 2015
%Y Cf. A002113, A002808, A053779, A053780.
%K base,nonn
%O 1,1
%A _G. L. Honaker, Jr._ and _Patrick De Geest_, Nov 15 2000