The first few deficient numbers are
Closely related to deficient numbers are perfect numbers with σ(n) = 2n, and abundant numbers with σ(n) > 2n. The natural numbers were first classified as either deficient, perfect or abundant by Nicomachus in his Introductio Arithmetica (circa 100).
US Patent Issued to International Business Machines on May 10 for "Minimizing Clock Uncertainty on Clock Distribution Networks Using a Multi-Level De-Skewing Technique" (New York Inventors)
May 12, 2011; ALEXANDRIA, Va., May 12 -- United States Patent no. 7,941,689, issued on May 10, was assigned to International Business Machines...