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  2. Python syntax and semantics - Wikipedia

    en.wikipedia.org/wiki/Python_syntax_and_semantics

    Python supports normal floating point numbers, which are created when a dot is used in a literal (e.g. 1.1), when an integer and a floating point number are used in an expression, or as a result of some mathematical operations ("true division" via the / operator, or exponentiation with a negative exponent).

  3. Primitive data type - Wikipedia

    en.wikipedia.org/wiki/Primitive_data_type

    byte, short, int, long, char (integer types with a variety of ranges) float and double, floating-point numbers with single and double precisions; boolean, a Boolean type with logical values true and false; returnAddress, a value referring to an executable memory address. This is not accessible from the Java programming language and is usually ...

  4. Perfect digit-to-digit invariant - Wikipedia

    en.wikipedia.org/wiki/Perfect_digit-to-digit...

    Let be a natural number which can be written in base as the k-digit number ... where each digit is between and inclusive, and = =.We define the function : as () = =. (As 0 0 is usually undefined, there are typically two conventions used, one where it is taken to be equal to one, and another where it is taken to be equal to zero.

  5. Happy number - Wikipedia

    en.wikipedia.org/wiki/Happy_number

    A simple test in Python to check if a number is happy: def pdi_function ( number , base : int = 10 ): """Perfect digital invariant function.""" total = 0 while number > 0 : total += pow ( number % base , 2 ) number = number // base return total def is_happy ( number : int ) -> bool : """Determine if the specified number is a happy number ...

  6. Narcissistic number - Wikipedia

    en.wikipedia.org/wiki/Narcissistic_number

    A natural number is a sociable narcissistic number if it is a periodic point for , where () = for a positive integer (here is the th iterate of ), and forms a cycle of period . A narcissistic number is a sociable narcissistic number with p = 1 {\displaystyle p=1} , and an amicable narcissistic number is a sociable narcissistic number with p = 2 ...

  7. Recursion (computer science) - Wikipedia

    en.wikipedia.org/wiki/Recursion_(computer_science)

    A natural number is either 1 or n+1, where n is a natural number. ... check value of current node, return true if match, ... input: integer x, ...

  8. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Prime number: A positive integer with exactly two positive divisors: itself and 1. The primes form an infinite sequence 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, ... Composite number: A positive integer that can be factored into a product of smaller positive integers. Every integer greater than one is either prime or composite.

  9. Dudeney number - Wikipedia

    en.wikipedia.org/wiki/Dudeney_number

    A natural number is a sociable Dudeney root if it is a periodic point for ,, where , = for a positive integer , and forms a cycle of period . A Dudeney root is a sociable Dudeney root with k = 1 {\displaystyle k=1} , and a amicable Dudeney root is a sociable Dudeney root with k = 2 {\displaystyle k=2} .