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  2. 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".

  3. 33 (number) - Wikipedia

    en.wikipedia.org/wiki/33_(number)

    33 is the 21st composite number, and 8th distinct semiprime (third of the form where is a higher prime). [1] It is one of two numbers to have an aliquot sum of 15 = 3 × 5 — the other being the square of 4 — and part of the aliquot sequence of 9 = 3 2 in the aliquot tree (33, 15, 9, 4, 3, 2, 1).

  4. How to Solve It - Wikipedia

    en.wikipedia.org/wiki/How_to_Solve_It

    Solve an equation [14] Also suggested: Look for a pattern [15] Draw a picture [16] Solve a simpler problem [17] Use a model [18] Work backward [19] Use a formula [20] Be creative [21] Applying these rules to devise a plan takes your own skill and judgement. [22] Pólya lays a big emphasis on the teachers' behavior.

  5. Julian Lennon underwent surgery to treat skin cancer ... - AOL

    www.aol.com/julian-lennon-underwent-surgery...

    Julian Lennon underwent surgery to treat skin cancer ... - AOL

  6. Morse code - Wikipedia

    en.wikipedia.org/wiki/Morse_code

    Chart of the Morse code 26 letters and 10 numerals [1]. This Morse key was originally used by Gotthard railway, later by a shortwave radio amateur [2]. Morse code is a telecommunications method which encodes text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs.

  7. Nancy Pelosi undergoes hip replacement surgery after fall in ...

    www.aol.com/nancy-pelosi-hospitalized-during...

    Democratic Rep. Nancy Pelosi, 84, underwent a successful hip replacement surgery after falling while in Luxembourg with a congressional delegation, her office said Saturday. "Earlier this morning ...

  8. NYT ‘Connections’ Hints and Answers Today, Sunday, December 15

    www.aol.com/nyt-connections-hints-answers-today...

    If you've been having trouble with any of the connections or words in Sunday's puzzle, you're not alone and these hints should definitely help you out. Plus, I'll reveal the answers further down ...

  9. List of integer sequences - Wikipedia

    en.wikipedia.org/wiki/List_of_integer_sequences

    16, 22, 34, 36, 46, 56, 64, 66, 70, 76, 78, 86, 88, ... The length of an interval of consecutive integers with property that every element has a factor in common with one of the endpoints. A059756