In number theory, an Erdős–Nicolas number is a number that is not perfect, but that equals one of the partial sums of its divisors. That is, a number n...

cardinal Erdős–Nicolas number Erdős conjecture — a list of numerous conjectures named after Erdős; See also List of conjectures by Paul Erdős. Erdős–Turán conjecture...

the natural number following 2015 and preceding 2017. 2016 is the second-smallest Erdős–Nicolas number after 24. 2016 is a triangular number. 2016 has a...

semiperfect number is a multiple of a primitive semiperfect number. Hemiperfect number Erdős–Nicolas number Zachariou+Zachariou (1972) Guy (2004) p. 75 Friedman...

Erdős number measures the "collaborative distance" between an author and Erdős. Thus, his direct co-authors have Erdős number one, theirs have number...

Paul Erdős (Hungarian: Erdős Pál [ˈɛrdøːʃ ˈpaːl]; 26 March 1913 – 20 September 1996) was a Hungarian mathematician. He was one of the most prolific mathematicians...

Jean-Louis Nicolas is a French number theorist. He is the namesake (with Paul Erdős) of the Erdős–Nicolas numbers, and was a frequent co-author of Erdős, who...

is prime 2015 – Lucas–Carmichael number 2016 – triangular number, number of 5-cubes in a 9-cube, Erdős–Nicolas number, 211-25 2017 – Mertens function zero...

In number theory, a positive integer k is said to be an Erdős–Woods number if it has the following property: there exists a positive integer a such that...

done by Alaoglu and Erdős (1944). Alaoglu and Erdős tabulated all highly abundant numbers up to 104, and showed that the number of highly abundant numbers...