J. V. Leyendekkers and A. G. Shannon

Notes on Number Theory and Discrete Mathematics, ISSN 1310–5132

Volume 17, 2011, Number 3, Pages 31–37

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## Details

### Authors and affiliations

J. V. Leyendekkers

Faculty of Science, The University of Sydney

Sydney, NSW 2006, Australia

A. G. Shannon

Faculty of Engineering & IT, University of Technology

Sydney, NSW 2007, Australia

### Abstract

An integer structure analysis (ISA) of the triangular, tetrahedral, pentagonal and pyramidal numbers is developed. The relationships among the elements and the powers of the elements of these sequences are discussed. In particular, the triangular and pentagonal numbers are directly linked and are structurally important for the formation of triples. The class structure in the modular rings Z_{3} and Z_{4} of some elements of these sequences reinforce previous studies of their properties.

### Keywords

- Integer structure analysis
- Modular rings
- Prime numbers
- Triangular numbers
- Pentagonal numbers.
- Octagonal numbers
- Repunits

### AMS Classification

- 11A41
- 11A07

### References

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- Leyendekkers, J. V., A. G. Shannon, J. M. Rybak. Pattern Recognition: Modular Rings

and Integer Structure. North Sydney: Raffles KvB Monograph, 2007, No. 9. - Leyendekkers, J. V., A. G. Shannon. Integer Structure Analysis of the Product of Adjacent Integers and Euler’s Extension of Fermat’s Last Theorem. Advanced Studies in Contemporary Mathematics. Vol. 17, 2008, No. 2, 221–229.
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*Z*_{4}. Notes on Number Theory and Discrete Mathematics. Vol. 16, 2010, No. 2, 29–32. - Leyendekkers, J. V., A. G. Shannon. The Number of Primitive Pythagorean Triples in a Given Interval. Notes on Number Theory and Discrete Mathematics. In press.
- Leyendekkers, J. V., A. G. Shannon. Modular Rings and the Integer 3. Notes on Number Theory and Discrete Mathematics. Vol. 17, 2011, No. 2, 47–51.
- Sloane, N. J. A., S. Plouffe. The Encyclopedia of Integer Sequences. San Diego, Academic Press, 1995.

## Related papers

## Cite this paper

Leyendekkers, J., & Shannon, A.(2011). The structure of geometric number sequences. *Notes on Number Theory and Discrete Mathematics*, 17(3), 31-37.