Publications (18) JOSE MARIA GRAU RIBAS publications

filter_list General Mathematics

2022

  1. COUNTING NON-ISOMORPHIC GENERALIZED HAMILTON QUATERNIONS

    International Electronic Journal of Algebra, Vol. 31, Núm. 31, pp. 143-160

  2. On μ -Sondow numbers

    Acta Mathematica Hungarica, Vol. 168, Núm. 1, pp. 217-227

2017

  1. On the diameter of the commuting graph of the full matrix ring over the real numbers

    Bulletin of the Iranian Mathematical Society, Vol. 43, Núm. 1, pp. 217-221

2016

  1. Solutions of the congruence 1+2f(n)+⋯+nf(n)≡0modn

    Mathematische Nachrichten, Vol. 289, Núm. 7, pp. 820-830

  2. Variations on Giuga numbers and Giuga’s congruence

    Ukrainian Mathematical Journal, Vol. 67, Núm. 11, pp. 1778-1785

2015

  1. A von Staudt-type result for (Formula presented.)

    Monatshefte fur Mathematik, Vol. 178, Núm. 3, pp. 345-359

  2. On the congruence 1m+ 2m +⋯+ mm≡ n(mod m) with n ∣ m

    Monatshefte fur Mathematik, Vol. 177, Núm. 3, pp. 421-436

2014

  1. On the last digit and the last non-zero digit of nn in base b

    Bulletin of the Korean Mathematical Society, Vol. 51, Núm. 5, pp. 1325-1337

2013

  1. An Exact Algorithm for the Continuous Quadratic Knapsack Problem via Infimal Convolution

    Intelligent Systems Reference Library, Vol. 38, pp. 97-127

  2. Corrigendum to "Cullen numbers with the Lehmer property"

    Proceedings of the American Mathematical Society, Vol. 141, Núm. 8, pp. 2941-2943

2012

  1. Cullen numbers with the lehmer property

    Proceedings of the American Mathematical Society, Vol. 140, Núm. 1, pp. 129-134

  2. Giuga numbers and the arithmetic derivative

    Journal of Integer Sequences, Vol. 15, Núm. 4

  3. Numerical approximation to ODEs using the error functional

    Proceedings of the American Mathematical Society, Vol. 140, Núm. 12, pp. 4295-4308

  4. On a variant of Giuga numbers

    Acta Mathematica Sinica, English Series, Vol. 28, Núm. 4, pp. 653-660

2011

  1. An Õ(log2(N)) time primality test for generalized Cullen numbers

    Mathematics of Computation, Vol. 80, Núm. 276, pp. 2315-2323

  2. On the base-b expansion of the number of trailing zeros of bk!

    Journal of Integer Sequences, Vol. 14, Núm. 6, pp. 1-16

2005

  1. New developments in the application of Pontryagin's Principle for the hydrothermal optimization

    IMA Journal of Mathematical Control and Information, Vol. 22, Núm. 4, pp. 377-393

2004

  1. A new algorithm for the optimization of a simple hydrothermal problem

    Communications in Nonlinear Science and Numerical Simulation, Vol. 9, Núm. 2, pp. 197-207