Positive integers n such that σ(ϕ(n))=σ(n).
De Koninck, Jean-Marie ; Luca, Florian
Journal of Integer Sequences [electronic only], Tome 11 (2008), / Harvested from The Electronic Library of Mathematics
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Publié le : 2008-01-01
EUDML-ID : urn:eudml:doc:45182 
@article{05274265,
     title = {Positive integers },
     journal = {Journal of Integer Sequences [electronic only]},
     volume = {11},
     year = {2008},
     zbl = {1188.11048},
     language = {en},
     url = {http://dml.mathdoc.fr/item/05274265}
}

De Koninck, Jean-Marie; Luca, Florian. Positive integers . Journal of Integer Sequences [electronic only], Tome 11 (2008) . http://gdmltest.u-ga.fr/item/05274265/