He worked on Waring's problem, in particular on the determination of exact values for the function g(n). He also published in diophantine approximation.
See also
Pillai's conjecture
Pillai's arithmetical function
External link
Biography and Mathematical Works of Pillai (http://www.geocities.com/thangadurai_kr/PILLAI.html)
Pillai, Pillay, Pulle or Pilli is a popular title of Tamil and Malayalam speaking people of India and others living in Sri Lanka, Singapore, Malaysia, South Africa, Fiji (See Tamil diaspora and Sri Lankan Tamils)
In Tamil Nadu this title or surname is predominantly used by Vellala caste population among the Tamil descent population, and the Nair caste population of the Malayalam speaking immigrant population, quite a few other castes also use this title.
Among the Nairs of Kerala Pillai is a title of nobility given by the feudal lords to senior military officers.
SUBBAYYASIVASANKARANARAYANAPillai (1901- 1950), a brilliant mathematician known for his remarkable work in Number Theory, was born on April 5,1901, at Vallam near Courtallam town in Tamilnadu.
Pillai had extended some of Ramanujan's work on highly composite numbers, already in 1933 but got it published in 1944,only after similar results due to ErdOs and Alaoglu came to be known.
Pillai's mathematical achievements seem to have peaked during his stay with Annamalai University and it was also then that he got his D.Sc degree from Madras University the first such for Mathematics there from.
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