Neither ∏k=1n(4k2+1) nor ∏k=1n(2k(k-1)+1) is a perfect square.
Fang, Jin-Hui
Integers, Tome 9 (2009), p. 177-180 / Harvested from The Electronic Library of Mathematics
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Publié le : 2009-01-01
DOI : https://doi.org/10.1515/INTEG.2009.017
EUDML-ID : urn:eudml:doc:129826 
@article{05552492,
     title = {Neither },
     journal = {Integers},
     volume = {9},
     year = {2009},
     pages = {177-180},
     doi = {10.1515/INTEG.2009.017},
     zbl = {1160.11008},
     language = {en},
     url = {http://dml.mathdoc.fr/item/05552492}
}

Fang, Jin-Hui. Neither . Integers, Tome 9 (2009) pp. 177-180. doi : 10.1515/INTEG.2009.017. http://gdmltest.u-ga.fr/item/05552492/