We show that there is an effectively computable upper bound of odd perfect numbers whose Euler factors are powers of fixed exponent.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-cm103-2-13, author = {Tomohiro Yamada}, title = {Odd perfect numbers of a special form}, journal = {Colloquium Mathematicae}, volume = {103}, year = {2005}, pages = {303-307}, zbl = {1086.11008}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-cm103-2-13} }
Tomohiro Yamada. Odd perfect numbers of a special form. Colloquium Mathematicae, Tome 103 (2005) pp. 303-307. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-cm103-2-13/