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A099149 Take a <= b such that f(a)+f(b)=concatenation of a and b, where f(k)=k(k+3)/2 (A000096). Sequence gives values of b.

%I A099149 #7 Oct 10 2017 06:13:05
%S A099149 5,6,8,8,6,5,59,78,384,98,98,506,78,1803,59,599,798,960,921,998,998,
%T A099149 14555,921,860,798,599,506,384,5999,6785,24615,7343,27170,7998,36005
%N A099149 Take a <= b such that f(a)+f(b)=concatenation of a and b, where f(k)=k(k+3)/2 (A000096). Sequence gives values of b.
%C A099149 For values of a, see A099148.
%e A099149 From _R. J. Mathar_, Oct 10 2017 (Start)
%e A099149 Values of a, then b, then f(a)+f(b) and concatenations (first a, then b or first b, then a), sorted on b, are:
%e A099149 0 0 0+0=0
%e A099149 2 5 5+20=25
%e A099149 3 6 9+27=36
%e A099149 8 8 44+44=88
%e A099149 8 9 44+54=98
%e A099149 6 14 27+119=146
%e A099149 5 15 20+135=155
%e A099149 0 17 0+170=170
%e A099149 20 59 230+1829=2059
%e A099149 39 78 819+3159=3978
%e A099149 98 98 4949+4949=9898
%e A099149 98 99 4949+5049=9998
%e A099149 78 158 3159+12719=15878
%e A099149 59 177 1829+15930=17759
%e A099149 77 384 3080+74304=77384
%e A099149 138 506 9729+128777=138506
%e A099149 200 599 20300+180299=200599
%e A099149 399 798 80199+319599=399798
%e A099149 492 860 121770+371090=492860
%e A099149 614 921 189419+425502=614921
%e A099149 998 998 499499+499499=998998
%e A099149 998 999 499499+500499=999998
%e A099149 921 1383 425502+958419=1383921
%e A099149 860 1505 371090+1134770=1505860
%e A099149 798 1598 319599+1279199=1598798
%e A099149 599 1797 180299+1617300=1797599
%e A099149 164 1803 13694+1628109=1641803
%e A099149 506 1859 128777+1730729=1859506
%e A099149 384 1920 74304+1846080=1920384
%e A099149 2000 5999 2003000+18002999=20005999
%e A099149 2655 6785 3528495+23028290=26556785
%e A099149  3213 7343 5166504+26970839=32137343
%e A099149  3999 7998 8001999+31995999=39997998
%e A099149 (End)
%Y A099149 Cf. A096032, A099148, A099150.
%K A099149 nonn,base
%O A099149 1,1
%A A099149 _John W. Layman_, Sep 30 2004
%E A099149 Edited by _Charles R Greathouse IV_, Apr 23 2010