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  2. Powerful number - Wikipedia

    en.wikipedia.org/wiki/Powerful_number

    2 = 3 35 2 10 = 13 33 7 18 = 19 2 − 7 3 = 3 5 − 15 2. It had been conjectured that 6 cannot be so represented, and Golomb conjectured that there are infinitely many integers which cannot be represented as a difference between two powerful numbers. However, Narkiewicz showed that 6 can be so represented in infinitely many ways such as

  3. English orthography - Wikipedia

    en.wikipedia.org/wiki/English_orthography

    English orthography comprises the set of rules used when writing the English language, [1] [2] allowing readers and writers to associate written graphemes with the sounds of spoken English, as well as other features of the language. [3] English's orthography includes norms for spelling, hyphenation, capitalisation, word breaks, emphasis, and ...

  4. Power of 10 - Wikipedia

    en.wikipedia.org/wiki/Power_of_10

    Visualisation of powers of 10 from one to 1 trillion. A power of 10 is any of the integer powers of the number ten; in other words, ten multiplied by itself a certain number of times (when the power is a positive integer). By definition, the number one is a power (the zeroth power) of ten. The first few non-negative powers of ten are: 1, 10 ...

  5. List of integer sequences - Wikipedia

    en.wikipedia.org/wiki/List_of_integer_sequences

    Name First elements Short description OEIS Mersenne prime exponents : 2, 3, 5, 7, 13, 17, 19, 31, 61, 89, ... Primes p such that 2 p − 1 is prime.: A000043 ...

  6. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    The golden ratio φ and its negative reciprocal −φ −1 are the two roots of the quadratic polynomial x 2 − x − 1. The golden ratio's negative −φ and reciprocal φ −1 are the two roots of the quadratic polynomial x 2 + x − 1. The golden ratio is also an algebraic number and even an algebraic integer.

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. Judy Greer had a very specific reason for turning down an audition for Modern Family.. The actress, 49, revealed in a recent episode of Jesse Tyler Ferguson’s podcast Dinner’s on Me that she ...

  9. Fibonacci sequence - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_sequence

    Lucas numbers have L 1 = 1, L 2 = 3, and L n = L n−1 + L n−2. Primefree sequences use the Fibonacci recursion with other starting points to generate sequences in which all numbers are composite. Letting a number be a linear function (other than the sum) of the 2 preceding numbers. The Pell numbers have P n = 2P n−1 + P n−2.