Form ‘Euclid’: Resolves any given composite number (up to 999999999) into prime factors. It makes unique prime factorization easy. Form ‘Eratosthenes’: Gives list of primes and pairs of twin primes up to 214749239. It is a prime list generator . This prime number generator also generates a list of twin primes. Form ‘Gauss’: Counts primes between two given numbers (within 214749263). "The true spirit of delight, the exaltation, the sense of being more than man, which is the touchstone of the highest excellence, is to be found in mathematics as surely as in poetry. What is best in mathematics deserves not merely to be learnt as a task, but to be assimilated as a part of daily thought, and brought again and again before the mind with ever-renewed encouragement." - Bertrand Russell