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  2. Digit sum - Wikipedia

    en.wikipedia.org/wiki/Digit_sum

    The concept of a decimal digit sum is closely related to, but not the same as, the digital root, which is the result of repeatedly applying the digit sum operation until the remaining value is only a single digit.

  3. Set-theoretic definition of natural numbers - Wikipedia

    en.wikipedia.org/wiki/Set-theoretic_definition...

    In Zermelo–Fraenkel (ZF) set theory, the natural numbers are defined recursively by letting 0 = {} be the empty set and n + 1 (the successor function) = n ∪ {n} for each n.

  4. Amateur chemistry - Wikipedia

    en.wikipedia.org/wiki/Amateur_chemistry

    Every year, operators of drug precursors are required to fill a questionnaire, titled "Annual questionnaire for the declaration of operations with scheduled chemicals" ("Cuestionario anual de declaración de operaciones con sustancias químicas catalogadas" in Spanish), stating in-depth details regarding purchases, sales, and operations ...

  5. HuffPost Data

    projects.huffingtonpost.com

    Interactive maps, databases and real-time graphics from The Huffington Post

  6. Triangular number - Wikipedia

    en.wikipedia.org/wiki/Triangular_number

    where (+) is notation for a binomial coefficient.It represents the number of distinct pairs that can be selected from n + 1 objects, and it is read aloud as "n plus one choose two".

  7. Jenks natural breaks optimization - Wikipedia

    en.wikipedia.org/wiki/Jenks_natural_breaks...

    The Jenks optimization method, also called the Jenks natural breaks classification method, is a data clustering method designed to determine the best arrangement of values into different classes.

  8. These Spring Soups Are Perfect for Those Chilly Rainy Days - AOL

    www.aol.com/spring-soups-perfect-those-chillier...

    Con Poulos. Ham and Bean Soup. This is a great way to use up leftover Easter ham! The diced ham adds a salty, smoky flavor to the broth that's so comforting. Get the Ham and Bean Soup recipe.

  9. Proth prime - Wikipedia

    en.wikipedia.org/wiki/Proth_prime

    A Proth number is a natural number N of the form = + where k and n are positive integers, k is odd and >.A Proth prime is a Proth number that is prime.They are named after the French mathematician François Proth. [2]