[1] Niţică, V. (2019) Infinite Sets of B-Additive and B-Multiplicative Ramanujan-Hardy Numbers. Journal of Integer Sequences, 22, Article 9.4.3.
[2] Niţică, V. (2018) About Some Relatives of the Taxicab Number. Journal of Integer Sequences, 21, Article 18.9.4.
[3] World of Numbers.
http://www.worldofnumbers.com/em36.htm