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Numbers with sum equal to 90.
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Ambata or both on both doubled.
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Ambi with identical sum and difference.
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The both imperial of Osvaldo Manara.
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Roll two dice at any time.
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Triangle with the same figure.
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Numbers arranged in a triangle with the same final number.
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Generate your fate numbers from a date.
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Equal isotope numbers.
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Consecutive numbers in first and fifth position.
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Find the missing number in a sequence of numbers.
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Random generator to play the Lotto.
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The Monco di San Ferdinando table.
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The numbers of Rutilio Benincasa.
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Ambata and ambi for the wheels of Milan and Naples.
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Least common multiple and greatest common divisor of two or more numbers.
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Calculator time cycles.
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Questions on resistance value and tolerance of a resistor.