Elementary proofs of parity results for 5-regular partitions

In a recent paper, Calkin et al. [N. Calkin, N. Drake, K. James, S. Law, P. Lee, D. Penniston and J. Radder, Divisibility properties of the 5-regular and 13-regular partition functions, Integers 8 (2008), #A60] used the theory of modular forms to examine 5-regular partitions modulo2 and 13-regular partitions modulo2 and3; they obtained and conjectured various results. In this note, we use nothing more than Jacobis triple product identity to obtain results for 5-regular partitions that are stronger than those obtained by Calkin and his collaborators. We find infinitely many Ramanujan-type congruences for b5(n), and we prove the striking result that the number of 5-regular partitions of the number n is even for at least 75% of the positive integers n.