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Published on May 27, 2014
About Touch Natural Numbers Prime numbers and composite numbers. Factors and factorization. (Multiplication and division) Ulam Spiral Parabolic Sieve Place Value (sum and subtraction) Modulo Polygonal numbers Number as the sum of two primes Number as the sum of three primes. Google Play: http://play.google.com/store/apps/det... (free app. No ads)