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Number Recreations by Shyam Sunder Gupta
Number Recreations , Rare numbers, Primes, sequence, amicable,perfect,sociable,Strong pseudoprime, Unlucky 13,EPORN, Reversible, fibonacci,titanic,aliquot,unique,Smith numbers, Happy, factorial, polynomials, recreational, Squares, palindromic, Smarandache, Subfactorial
The Place for Number lovers , Number theorists, interested in Number Recreations, computational number theory and recreational number theory