Pollock's conjectures are two closely related unproven conjectures in additive number theory. They were first stated in 1850 by Sir Frederick Pollock, better known as a lawyer and politician, but also a contributor of papers on mathematics to the Royal Society. These conjectures are a possible extension of the Fermat polygonal number theorem to three-dimensional figurate numbers, also called polyhedral numbers.
- Pollock tetrahedral numbers conjecture: Every positive integer is the sum of at most five tetrahedral numbers.
- Pollock octahedral numbers conjecture: Every positive integer is the sum of at most seven octahedral numbers.
- Dickson, L. E. (June 7, 2005). History of the Theory of Numbers, Vol. II: Diophantine Analysis. Dover. pp. 22–23. ISBN 0-486-44233-0.
- Frederick Pollock (1850). "On the extension of the principle of Fermat's theorem on the polygonal numbers to the higher order of series whose ultimate differences are constant. With a new theorem proposed, applicable to all the orders". Abstracts of the Papers Communicated to the Royal Society of London. 5: 922–924. JSTOR 111069.
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