@article{JIS_2005__8_3_a1,
     author = {M\"uller, Tom},
     title = {Prime and composite terms in {Sloane's} sequence {A056542}},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {8},
     number = {3},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2005__8_3_a1/}
}