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Shahbaz Ali and Khalid Mahmood, <a href="https://www.ijmex.com/index.php/ijmex/article/view/975/434">New Numbers on Euler’s Totient Function with Applications</a>, Journal of Mathematical Extension, Vol. 14, No. 1, (2020), 61-83.
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Joshua Harrington, Tony W. H. Wong, <a href="https://doi.org/10.1016/j.disc.2019.111670">On super totient numbers and super totient labelings of graphs</a>, Discrete Mathematics Vol. 343, Iss. 2 , , February 2020, 111670.
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Supertotient numbers: numbers k such that the set of numbers less than k and relatively prime to k can be partitioned into two disjoint subsets of equal sum.
Complement The concept of A332555supertotient numbers was introduced by Mahmood and Ali (2017). - _Amiram Eldar_, Apr 14 2020
The concept of supertotient numbers was introduced by Mahmood and Ali (2017). These are numbers k such that the set of numbers less than k and relatively prime to k can be partitioned into two disjoint subsets of equal sum. - Amiram Eldar, Apr 14 2020
The concept of supertotient numbers was introduced by Mahmood and Ali (2017). These are numbers k such that the set of numbers less than k and relatively prime to k can be partitioned into two disjoint subsets of equal sum. - Amiram Eldar, Apr 14 2020
A023896(a(n)) == 0 (mod 2). - Amiram Eldar, Apr 14 2020
Select[Complement[Range[100], {1, 2, 4, 6, 18}], PrimeNu[#] > 1 || Mod[FactorInteger[#][[1, 1]], 4] != 3 &] (* Amiram Eldar, Apr 14 2020 *)