3x+1 minus the +.
Monks, Kenneth G.
Discrete Mathematics and Theoretical Computer Science. DMTCS [electronic only], Tome 5 (2002), p. 47-54 / Harvested from The Electronic Library of Mathematics
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Publié le : 2002-01-01
EUDML-ID : urn:eudml:doc:122721 
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     title = {<title-group xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><article-title xml:lang="en"><math><mrow><mn>3</mn><mi>x</mi><mo>+</mo><mn>1</mn></mrow></math> minus the <math><mo>+</mo></math>.</article-title></title-group>},
     journal = {Discrete Mathematics and Theoretical Computer Science. DMTCS [electronic only]},
     volume = {5},
     year = {2002},
     pages = {47-54},
     zbl = {1014.68094},
     language = {en},
     url = {http://dml.mathdoc.fr/item/01740999}
}

Monks, Kenneth G. 3x+1 minus the +.. Discrete Mathematics and Theoretical Computer Science. DMTCS [electronic only], Tome 5 (2002) pp. 47-54. http://gdmltest.u-ga.fr/item/01740999/