Triangular repunit-there is but 1 John H. Jaroma — 2010 Czechoslovak Mathematical Journal In this paper, we demonstrate that 1 is the only integer that is both triangular and a repunit.
On the appearance of primes in linear recursive sequences. Jaroma, John H. — 2005 Advances in Difference Equations [electronic only]
Sylvester: ushering in the modern era of research on odd perfect numbers. Gimbel, Steven; Jaroma, John H. — 2003 Integers