TY - BOOK AU - Nagaraj, S. V. TI - Problems in Algorithmic Number theory PY - 1999/// KW - Computer Science KW - Algorithmic Number Theory KW - Computational Number Theory N1 - 1999 N2 - This thesis presents new results for four problems in the field of Algorithmic and Computational Number Theory. The first gives an improved analysis of algorithms for testing whether a given positive integer n is a perfect power. The second problem gives an improved upper bound on the worst case numbers for a variant of the strong pseudo prime test, very close to settling a Granville's Conjecture. The third result is about progress towards a conjecture of S.W. Graham; It is shown that his conjecture is true for an improved condition. The fourth result deals with the problem of finding the least witness w(n) of a composite number n. A number w is a witness for a composite number n if n is not a strong Pseudo-prime to the base w. Other interesting algorithmic results about witnesses are also presented UR - http://www.imsc.res.in/xmlui/handle/123456789/85 ER -