2024

• Some results on factorization. CECC 2024, Military University of Technology in Warsaw, Poland, on June 20th - 21st.

2023

• : Elliptic curves and Factorization, Colloquium at Math department Univesity of Cape Town, South Africa, November 30.

2022

• Factoring with extra information, QVNTS, Concordia Univesity, Montreal, Canada, September 15.
• Is it easy to factorize RSA moduli?, Number Theoretic methods in Cryptology, Adam Mickiewicz Univerisity, Poznan, Poland 30-8-2022

Visitando la factorización de números que son producto de dos primos. Universidad del Cauca, Popayan, 14/6/2019

Malleability of RSA moduli. Universidad de Santander, bienal de la RSME, Santader, 7/2/2019

Tracebility of Reed Solomon codes. ICIAM, Universidad de Valencia, Valencia, 16/7/2019

Primitive roots and malleability of RSA moduli. ISI, Kolkata, 16/2/2017

Some problems on the arithmetic of elliptic curves. ISI, Kolkata, 17/2/2017

Irreducibility and the distribution of some exponential sums, HRI, Allahabad, India, 21/2/2017

Irreducibility and the distribution of some exponential sums, ICMAT, Madrd, 10/9/2017

A remark on Kummer´s conjecture, Institute of mathematical science, Chennai, India, 13/12/2013

Irreducibility and the distribution of some exponential sums, Institute of mathematics, Chinese academy of sciences, Beijing, China, 16/8/2013

Irreducibility and the distribution of some exponential sums, RICAM,Linz, Austria, 25/11/2013

Square free discriminants of Frobenius rings. Universitá Tor-Vergata, Rome, 21/5/2010

Almost prime orders of CM elliptic curves modulo p. University of Alberta, Edmonton, Canada 20/8/2008

Square free discriminants of Frobenius rings. University of Alberta, Edmonton, Canada 20/8/2008

Formas modulares con cuerpos de coeficientes grandes via congruencias, Universidad Autonoma de Madrid, Madrid, 15/10/2008

El Instituto Clay: Se compran ideas a un millón de dólares, Universidad de la Rioja, Logroño, 11/12/2009

Almost prime orders of elliptic curves with CM modulo p, Mc Gill University, Montreal, Canada, 26/01/2006

Almost prime orders of CM elliptic curves modulo primes, ICM, Madrid, 26/8/2006

Isogenia_AGM, UPC, Barcelona, 10/9/2004

Double Wieferich, Workshop Sa Conjectura de Catalan. Museu de Menorca, Maó, Setembre 3/9/2004.

On the Ramanujan conjecture on congruence of the partition function , UPC, Barcelona, 31/1/2001

1999

• Lattice points on Hyperbolas. Penn State University, Pennsylvania, USA, 21/1/1999.
• On a conjecture of Erdos and Rosenfeld. Penn State University, Pennsylvania, USA, 26/1/1999.
• Ceros no triviales de funciones L de curvas elípticas. Universitat de Barcelona, Barcelona, España, 9/6/1999.
• Divisores de enteros y curvas elípticas.. Universitat Politécnica de Catalunya, Barcelona, España, 10/6/1999.

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