Soit $E$ une courbe elliptique sur $\mathbb{Q}$ par un modèle de Weierstrass généralisé :$$y^2+A_{1}xy+A_{3}y=x^3+A_2{x}^2+A_{4}x+A_6;A_i\in \mathbb{Z}.$$Soit $M=(a/d^2,b/d_3)$ avec $(a,d)=1$, un point rationnel sur cette courbe. Pour tout entier $m$, on exprime les coordonnées de $mM$ sous la forme :$$mM=\left(\frac{{\phi }_m\left(M\right)}{{\psi }_n^2\left(m\right)},\frac{{\omega }_m\left(M\right)}{{\psi }_m^3\left(M\right)}\right)=\left(\frac{{\widehat{\phi }}_m}{d^2{\widehat{\psi }}_m^2},\frac{{\widehat{\omega }}_m}{d^3{\widehat{\psi }}_m^3}\right),$$où ${\phi }_m,\psi \_m,{\omega }_m\in \mathbb{Z}[A_1,\cdots ,A_6,x,y]$ et ${\widehat{\phi }}_m$, ${\widehat{\psi }}_m$, ${\widehat{\omega }}_m$ sont déduits par multiplication par des puissances convenables de $d$.Soit $p$ un nombre premier impair et supposons que $M\left(\mathrm{mod}p\right)$ est non singulier et que le rang d’apparition de $p$ dans la suite d’entiers $\left({\widehat{\psi }}_m\right)$ est supérieur ou égal à trois. Notons ce rang par $r=r\left(p\right)$ et soit ${\nu }_p({\widehat{\psi }}_r)=e_0\ge 1$. Nous montrons que la suite $\left({\widehat{\psi }}_m\right)$...

Let K be a finite Galois extension of the field ℚ of rational numbers. We prove an asymptotic formula for the number of Piatetski-Shapiro primes not exceeding a given quantity for which the associated Frobenius class of automorphisms coincides with any given conjugacy class in the Galois group of K/ℚ. In particular, this shows that there are infinitely many Piatetski-Shapiro primes of the form a² + nb² for any given natural number n.

Integer sequences of the form $\lfloor n^c\rfloor$, where 1 < c < 2, can be locally approximated by sequences of the form ⌊nα+β⌋ in a very good way. Following this approach, we are led to an estimate of the difference ${\sum }_{n\le x}\phi \left(\lfloor n^c\rfloor \right)-1/c{\sum }_{n\le x^c}\phi \left(n\right)n^{1/c-1}$, which measures the deviation of the mean value of φ on the subsequence $\lfloor n^c\rfloor$ from the expected value, by an expression involving exponential sums. As an application we prove that for 1 < c ≤ 1.42 the subsequence of the Thue-Morse sequence indexed by $\lfloor n^c\rfloor$ attains both of its values with asymptotic...

Chou, Hsu and Shiue gave some applications of Faà di Bruno's formula to characterize inverse relations. Our aim is to develop some inverse relations connected to the multipartitional type polynomials involving to binomial type sequences.

A study of certain Hamiltonian systems has led Y. Long to conjecture the existence of infinitely many primes which are not of the form p = 2⌊αn⌋ + 1, where 1 < α < 2 is a fixed irrational number. An argument of P. Ribenboim coupled with classical results about the distribution of fractional parts of irrational multiples of primes in an arithmetic progression immediately implies that this conjecture holds in a much more precise asymptotic form. Motivated by this observation, we give an asymptotic...

We show that if a > 1 is any fixed integer, then for a sufficiently large x>1, the nth Cullen number Cₙ = n2ⁿ +1 is a base a pseudoprime only for at most O(x log log x/log x) positive integers n ≤ x. This complements a result of E. Heppner which asserts that Cₙ is prime for at most O(x/log x) of positive integers n ≤ x. We also prove a similar result concerning the pseudoprimality to base a of the Woodall numbers given by Wₙ = n2ⁿ - 1 for all n ≥ 1.