On Wolstenholme's theorem and its converse

Charles Helou, Guy Terjanian

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


For any positive integer n, let wn = ((2 n - 1; n - 1)) = frac(1, 2) ((2 n; n)). Wolstenholme proved that if p is a prime ≥5, then wp ≡ 1 (mod p3). The converse of Wolstenholme's theorem, which has been conjectured to be true, remains an open problem. In this article, we establish several relations and congruences satisfied by the numbers wn, and we deduce that this converse holds for many infinite families of composite integers n. In passing, we obtain a number of congruences satisfied by certain classes of binomial coefficients, and involving the Bernoulli numbers.

Original languageEnglish (US)
Pages (from-to)475-499
Number of pages25
JournalJournal of Number Theory
Issue number3
StatePublished - Mar 2008

All Science Journal Classification (ASJC) codes

  • Algebra and Number Theory


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