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  2. Fibonacci sequence - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_sequence

    The number of binary strings of length n without an odd number of consecutive 1 s is the Fibonacci number F n+1. For example, out of the 16 binary strings of length 4, there are F 5 = 5 without an odd number of consecutive 1 s—they are 0000, 0011, 0110, 1100, 1111.

  3. 13 (number) - Wikipedia

    en.wikipedia.org/wiki/13_(number)

    13 (thirteen) is the natural number following 12 and preceding 14.. Folklore surrounding the number 13 appears in many cultures around the world: one theory is that this is due to the cultures employing lunar-solar calendars (there are approximately 12.41 lunations per solar year, and hence 12 "true months" plus a smaller, and often portentous, thirteenth month).

  4. 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.

  5. Ternary numeral system - Wikipedia

    en.wikipedia.org/wiki/Ternary_numeral_system

    As for rational numbers, ternary offers a convenient way to represent ⁠ 1 / 3 ⁠ as same as senary (as opposed to its cumbersome representation as an infinite string of recurring digits in decimal); but a major drawback is that, in turn, ternary does not offer a finite representation for ⁠ 1 / 2 ⁠ (nor for ⁠ 1 / 4 ⁠, ⁠ 1 / 8 ...

  6. Maya numerals - Wikipedia

    en.wikipedia.org/wiki/Maya_numerals

    The Mayan numeral system was the system to represent numbers and calendar dates in the Maya civilization.It was a vigesimal (base-20) positional numeral system.The numerals are made up of three symbols: zero (a shell), [1] one (a dot) and five (a bar).

  7. Angel Number 13—What It Means, Why You're Seeing It and ...

    www.aol.com/lifestyle/angel-number-13-means-why...

    The meaning of seeing the angel number 1313 in love is much the same as seeing the number 13, with more of an enhancement on twin flames. Since this number is double 13s, it is definitely an ...

  8. AOL Mail

    mail.aol.com

    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!

  9. Latin numerals - Wikipedia

    en.wikipedia.org/wiki/Latin_Numerals

    Numbers may either precede or follow their noun (see Latin word order). Most numbers are invariable and do not change their endings: regnāvit Ancus annōs quattuor et vīgintī (Livy) [1] 'Ancus reigned for 24 years' However, the numbers 1, 2, 3, and 200, 300, etc. change their endings for gender and grammatical case.