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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. 3
5, 6, 8, 8, 6, 5, 59, 78, 384, 98, 98, 506, 78, 1803, 59, 599, 798, 960, 921, 998, 998, 14555, 921, 860, 798, 599, 506, 384, 5999, 6785, 24615, 7343, 27170, 7998, 36005 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

For values of a, see A099148.

LINKS

Table of n, a(n) for n=1..35.

EXAMPLE

From R. J. Mathar, Oct 10 2017 (Start)

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:

0 0 0+0=0

2 5 5+20=25

3 6 9+27=36

8 8 44+44=88

8 9 44+54=98

6 14 27+119=146

5 15 20+135=155

0 17 0+170=170

20 59 230+1829=2059

39 78 819+3159=3978

98 98 4949+4949=9898

98 99 4949+5049=9998

78 158 3159+12719=15878

59 177 1829+15930=17759

77 384 3080+74304=77384

138 506 9729+128777=138506

200 599 20300+180299=200599

399 798 80199+319599=399798

492 860 121770+371090=492860

614 921 189419+425502=614921

998 998 499499+499499=998998

998 999 499499+500499=999998

921 1383 425502+958419=1383921

860 1505 371090+1134770=1505860

798 1598 319599+1279199=1598798

599 1797 180299+1617300=1797599

164 1803 13694+1628109=1641803

506 1859 128777+1730729=1859506

384 1920 74304+1846080=1920384

2000 5999 2003000+18002999=20005999

2655 6785 3528495+23028290=26556785

3213 7343 5166504+26970839=32137343

3999 7998 8001999+31995999=39997998

(End)

CROSSREFS

Cf. A096032, A099148, A099150.

Sequence in context: A308191 A111770 A105738 * A197480 A180443 A205705

Adjacent sequences:  A099146 A099147 A099148 * A099150 A099151 A099152

KEYWORD

nonn,base

AUTHOR

John W. Layman, Sep 30 2004

EXTENSIONS

Edited by Charles R Greathouse IV, Apr 23 2010

STATUS

approved

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Last modified November 17 23:26 EST 2019. Contains 329242 sequences. (Running on oeis4.)