- Amicable Numbers
- Explains distributions, observations and calculations of friendly numbers, with details on Harshad and Happy pairs.
- Catalan Conjecture - Aliquot Sequences
- Contains definition, tables, diagrams, databases and links. With factorization of integers and list of programs, projects and records.
- Christophe Clavier - Aliquot Sequences
- Carries out table on statistics and all open ending sequences.
- Cubes of Perfection
- Explains perfect number specified by Euclid's formula and used with different patterns.
- Juan L. Varona - Aliquot Sequences
- Explains calculation and functions of positive integer, perfect number, and status of sequences.
- Multiply Perfect Numbers
- Contains table on status and historical development of known MPN, and explanation of data and algebraic transformations.
- Paul Zimmermann - Aliquot Sequences
- Contains definition and investigation on sequences, with tools and table on current status.
- Perfect Number - Wolfram MathWorld
- Illustrates computation, definition and table with corresponding indices.
- Tables of Aliquot Cycles
- Presents table with various known cycles of amicable, sociable, and perfect numbers.
- Wieb Bosma - Aliquot Sequences
- Explains the Catalan-Dickson conjecture, related methods, and status summary of computation.
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