6 citations · 6 across the 2 of their papers we have counts for
5 papers
Some properties of Zumkeller numbers and -layered numbers
Pankaj Jyoti Mahanta, Manjil P. Saikia, Daniel Yaqubi
Generalizing the concept of a perfect number is a Zumkeller or integer perfect number that was introduced by Zumkeller in 2003. The positive integer is a Zumkeller number if it…
Some results on average of Fibonacci and Lucas sequences
Daniel Yaqubi, Amirali Fatehizadeh
In this paper, we discuss about some results on average of Fibonacci and Lucas sequences that may be found in the OEIS code A111035.
Mixed coloured permutations
Beáta Bényi, Daniel Yaqubi
In this paper we introduce mixed coloured permutation, permutations with certain coloured cycles, and study the enumerative properties of these combinatorial objects. We derive the…
Mixed restricted Stirling numbers
Somaya Barati, Beáta Bényi, Abbas Jafarzadeh +1
In this note we investigate mixed partitions with extra condition on the sizes of the blocks. We give a general formula and the generating function. We consider in more details a s…
Some determinants of path generating functions, II
Christian Krattenthaler, Daniel Yaqubi
We evaluate Hankel determinants of matrices in which the entries are generating functions for paths consisting of up-steps, down-steps and level steps with a fixed starting point b…