#### One of Leon Hall's Erdos number = 3 chains:

Hall and Wagon, "Roads and wheels", *Mathematics Magazine*
71 (1998), 285-291

Baumgartner, Taylor, and Wagon, "On splitting stationary subsets of large cardinals", *J. Symbolic Logic* 42 (1997), no. 2, 203-214

Baumgartner, Erdos, and Higgs, "Colorful partitions of cardinal numbers", *Canad. J. Math.* 31 (1979), no. 3, 524-541

#### One of Leon Hall's Erdos number of 2nd kind = 4 chains:

Hall and Wagon, "Roads and wheels", *Mathematics Magazine*
71 (1998), 285-291

Wagon and Wilf, "When are subset sums equidistributed modulo m?", *Electron. J. Combin.* 1 (1994), Research Paper 3, approx 15 pp (electronic)

Odlyzko and Wilf, "Functional iteration and the Josephus problem", *Glasgow Math. J.* 33 (1991), no. 2, 235-240

Erdos and Odlyzko, "On the density of odd integers of the form $(p-1) 2\sp{-n}$ and related questions", *J. Number Theory* 11 (1979), no. 2, 257-263