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2. Kaktovik numerals - Wikipedia

   en.wikipedia.org/wiki/Kaktovik_numerals

   30,561 10 3,G81 20 ÷ ÷ ÷ 61 10 31 20 = = = 501 10 151 20 30,561 10 ÷ 61 10 = 501 10 3,G81 20 ÷ 31 20 = 151 20 ÷ = (black) The divisor goes into the first two digits of the dividend one time, for a one in the quotient. (red) fits into the next two digits once (if rotated), so the next digit in the quotient is a rotated one (that is, a five). (blue) The last two digits are matched once for ...

3. 20 (number) - Wikipedia

   en.wikipedia.org/wiki/20_(number)

   In combinatorics, 20 is the number of distinct combinations of 6 items taken 3 at a time. Equivalently, it is the central binomial coefficient for n=3 (sequence A000984 in the OEIS). In decimal, 20 is the smallest non-trivial neon number equal to the sum of its digits when raised to the thirteenth power (20 13 = 8192 × 10 13). [citation needed]

4. List of integer sequences - Wikipedia

   en.wikipedia.org/wiki/List_of_integer_sequences

   Tetrahedral numbers T(n) 0, 1, 4, 10, 20, 35, 56, 84, 120, 165, ... T(n) is the sum of the first n triangular numbers, with T(0) = 0 (empty sum). A000292: Square pyramidal numbers: 0, 1, 5, 14, 30, 55, 91, 140, 204, 285, ... ⁠ n(n + 1)(2n + 1) / 6 ⁠: The number of stacked spheres in a pyramid with a square base. A000330: Cube numbers n 3

5. Bell number - Wikipedia

   en.wikipedia.org/wiki/Bell_number

   The permutations that avoid the generalized patterns 12-3, 32-1, 3-21, 1-32, 3-12, 21-3, and 23-1 are also counted by the Bell numbers. [4] The permutations in which every 321 pattern (without restriction on consecutive values) can be extended to a 3241 pattern are also counted by the Bell numbers. [ 5 ]

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7. List of types of numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_types_of_numbers

   Such a number is algebraic and can be expressed as the sum of a rational number and the square root of a rational number. Constructible number: A number representing a length that can be constructed using a compass and straightedge. Constructible numbers form a subfield of the field of algebraic numbers, and include the quadratic surds.

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9. The Virtuoso Pianist in 60 Exercises - Wikipedia

   en.wikipedia.org/wiki/The_Virtuoso_Pianist_in_60...

   The exercises are divided in three parts: Exercises 1 - 20: Labeled "preparatory exercises", these are also the most famous exercises, and are used to develop finger strength and independence. Each exercise contains a sequence of 8 semiquavers, beginning on C, which is then repeated starting on D, and so on across two octaves. The exercise is ...