**46**(2016)

ISSN 1787-5021 (Print)

ISSN 1787-6117 (Online)

## Content

### Research papers:

Statistics in words and partitions of a set

by Walaa Asakly

Pages: 3–12

Avatar-Based Sport Science Soccer Simulations

by Norbert Bátfai, András Mamenyák, Péter Jeszenszky, Gergely Kövér, Máté Smajda, Renátó Besenczi, Béla Halász, György Terdik, Márton Ispány

Pages: 13–36

On the Mersenne sequence

by Paula Catarino, Helena Campos, Paulo Vasco

Pages: 37–53

Case Study for the vudc R Package

by Csaba Faragó

Pages: 55–75

Solutions of some particular pexiderized digital filtering functional equation

by Charinthip Hengkrawit, Vichian Laohakosol, Khanithar Naenudorn

Pages: 77–96

The Miki-type identity for the Apostol-Bernoulli numbers

by Orli Herscovici, Toufik Mansour

Pages: 97–114

A note on the derived length of the group of units of group algebras of characteristic two

by Tibor Juhász

Pages: 115–120

Maintainability of classes in terms of bug prediction

by Gergely Ladányi

Pages: 121–142

Methods to analysis of queueing models with state-dependent jump priorities

by Agassi Melikov, Anar Rustamov, Turan Jafarzade, János Sztrik

Pages: 143–163

Recurrence sequences in the hyperbolic Pascal triangle corresponding to the regular mosaic {4, 5}

by László Németh, László Szalay

Pages: 165–173

Generalized r-Whitney numbers of the first kind

by José L. Ramírez, Mark Shattuck

Pages: 175–193

On the (s,t)-Pell and (s,t)-Pell-Lucas numbers by matrix methods

by Somnuk Srisawat, Wanna Sriprad

Pages: 195–204

Convolution of second order linear recursive sequences I.

by Tamás Szakács

Pages: 205–216

Evolutionary computing based QoS oriented energy efficient VM consolidation scheme for large scale cloud data centers using random work load bench

by Perla Ravi Theja, SK. Khadar Babu

Pages: 217–241

### Methodological papers:

On a variant of the Lucas’ square pyramid problem

by Salima Kebli, Omar Kihel

Pages: 245–250

Equivalence relation as a tool to create new structures. How could they be prepared and taught in schools?

by Zsuzsa Nagy Lehocká, Ödön Vancsó

Pages: 251–264

Gender differences in spatial visualization skills of engineering students

by Rita Nagy-Kondor

Pages: 265–276

The impacts of the introduction of the function concept on students’ skills

by Gyöngyi Szanyi

Pages: 277–291