Javascript must be enabled to continue!
A variant of the Hardy-Ramanujan theorem
View through CrossRef
For each natural number $n$, we define $\omega^*(n)$ to be the number of primes $p$ such that $p-1$ divides $n$. We show that in contrast to the Hardy-Ramanujan theorem which asserts that the number $\omega(n)$ of prime divisors of $n$ has a normal order $\log\log n$, the function $\omega^*(n)$ does not have a normal order. We conjecture that for some positive constant $C$, $$\sum_{n\leq x} \omega^*(n)^2 \sim Cx(\log x). $$ Another conjecture related to this function emerges, which seems to be of independent interest. More precisely, we conjecture that for some constant $C>0$, as $x\to \infty$, $$\sum_{[p-1,q-1]\leq x} {1 \over [p-1, q-1]} \sim C \log x, $$ where the summation is over primes $p,q\leq x$ such that the least common multiple $[p-1,q-1]$ is less than or equal to $x$.
Centre pour la Communication Scientifique Directe (CCSD)
Title: A variant of the Hardy-Ramanujan theorem
Description:
For each natural number $n$, we define $\omega^*(n)$ to be the number of primes $p$ such that $p-1$ divides $n$.
We show that in contrast to the Hardy-Ramanujan theorem which asserts that the number $\omega(n)$ of prime divisors of $n$ has a normal order $\log\log n$, the function $\omega^*(n)$ does not have a normal order.
We conjecture that for some positive constant $C$, $$\sum_{n\leq x} \omega^*(n)^2 \sim Cx(\log x).
$$ Another conjecture related to this function emerges, which seems to be of independent interest.
More precisely, we conjecture that for some constant $C>0$, as $x\to \infty$, $$\sum_{[p-1,q-1]\leq x} {1 \over [p-1, q-1]} \sim C \log x, $$ where the summation is over primes $p,q\leq x$ such that the least common multiple $[p-1,q-1]$ is less than or equal to $x$.
Related Results
Thomas Hardy
Thomas Hardy
Thomas Hardy was born in Lower Bockhampton, Dorset, in 1840 and, with brief interruptions, continued to live in and around Dorchester until his death in 1928. His work was intimate...
Dual Ramanujan-Fourier series
Dual Ramanujan-Fourier series
Let cq(n) be the Ramanujan sums. Many results concerning Ramanujan-Fourier series f (n) = ∞ q=1 aqcq(n) are obtained by many mathematicians. In this paper we study series of the fo...
Frequency and Diversity of Variant Philadelphia Chromosome In Chronic Myeloid Leukemia Patients
Frequency and Diversity of Variant Philadelphia Chromosome In Chronic Myeloid Leukemia Patients
Abstract
Abstract 4903
The Philadelphia chromosome (Ph), t(9;22), is detected in around 90% of the chronic myeloid leukemia (CML) patients, but in the...
A simple Van der Heijde’s Disease Activity Score to determine if a patient has contracted the new Nigerian variant or suffers from the Betcherew’s syndrome
A simple Van der Heijde’s Disease Activity Score to determine if a patient has contracted the new Nigerian variant or suffers from the Betcherew’s syndrome
Sir, A new strain of coronavirus first detected in Nigeria has made its way into the UK, with 32 cases reported. Eminent experts have warned the variant may prove resistant to all...
Abstract P1-05-23: Utilities and challenges of RNA-Seq based expression and variant calling in a clinical setting
Abstract P1-05-23: Utilities and challenges of RNA-Seq based expression and variant calling in a clinical setting
Abstract
Introduction
Variant calling based on DNA samples has been the gold standard of clinical testing since the advent of Sanger sequencing. The u...
New and explicit constructions of unbalanced Ramanujan bipartite graphs
New and explicit constructions of unbalanced Ramanujan bipartite graphs
AbstractThe objectives of this article are threefold. Firstly, we present for the first time explicit constructions of an infinite family of unbalanced Ramanujan bigraphs. Secondly...
Small diameters and generators for arithmetic lattices in $$\textrm{SL}_2(\mathbb {R})$$ and certain Ramanujan graphs
Small diameters and generators for arithmetic lattices in $$\textrm{SL}_2(\mathbb {R})$$ and certain Ramanujan graphs
AbstractWe show that arithmetic lattices in $$\textrm{SL}_{2}(\mathbb {R})$$
SL
2
...
On an identity of Ramanujan
On an identity of Ramanujan
Proofs published so far in articles and books, of the Ramanujan identity presented in this note, which depend on Euler products, are essentially the same as Ramanujan's original pr...

