Research on the theory of modular forms and modular functions using Mathematica

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We find the congruences between extremal modular forms and theta series of special types modulo powers of 2 and 3.This assertion enables us to prove that 2n-th root of the extremal modular forms of weight n/2 have at least one non integer coefficient.Let f(z) be a Hauptmodul for level 2 congruence subgroup that has zero at the cusp infinity. We construct the 2-adic modular form F from f(z) by using Atkin's method. We expand F as a formal power series in f(z). We can compute explicitly the 2-adic ordinal of these coefficients of the f-expansion of F.