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2. 21 (number) - Wikipedia

   en.wikipedia.org/wiki/21_(number)

   Mathematics. Twenty-one is the fifth distinct semiprime, and the second of the form where is a higher prime. It is a repdigit in quaternary (111 4).. Properties. As a biprime with proper divisors 1, 3 and 7, twenty-one has a prime aliquot sum of 11 within an aliquot sequence containing only one composite number (21, 11, 1, 0); it is the second composite number with an aliquot sum of 11 ...

3. How Mom-umental! 25 Free, Printable Mother's Day Cards To ...

   www.aol.com/mom-umental-25-free-printable...

   2. Child's Handprint on Printable Mother's Day Card. iStock. 3. Simple Yet Sweet Love You Mom Card. Canva. 4. Foldable Artistic Mother Holding Child Mother's Day Card. Canva.

4. Nehushtan - Wikipedia

   en.wikipedia.org/wiki/Nehushtan

   However they had to detour around the land of Edom (Numbers 20:21, 25). Impatient, they complained against Yahweh and Moses (Numbers 21:4–5), and in response God sent "fiery serpents" among them and many died. The people came to Moses to repent and asked him to ask God to take away the serpents.

5. Fibonacci sequence - Wikipedia

   en.wikipedia.org/wiki/Fibonacci_sequence

   A tiling with squares whose side lengths are successive Fibonacci numbers: 1, 1, 2, 3, 5, 8, 13 and 21. In mathematics, the Fibonacci sequence is a sequence in which each number is the sum of the two preceding ones. Numbers that are part of the Fibonacci sequence are known as Fibonacci numbers, commonly denoted Fn .

6. Lucky number - Wikipedia

   en.wikipedia.org/wiki/Lucky_number

   21: 23: 25 The first number remaining in the list after 1 is 3, so every third number (beginning at 1) which remains in the list (not every multiple of 3) is eliminated. The first of these is 5: 1: 3: 7: 9: 13: 15: 19: 21: 25 The next surviving number is now 7, so every seventh remaining number is eliminated. The first of these is 19: 1: 3: 7 ...

7. Multiplication table - Wikipedia

   en.wikipedia.org/wiki/Multiplication_table

   Multiplication table from 1 to 10 drawn to scale with the upper-right half labeled with prime factorisations. In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system. The decimal multiplication table was traditionally taught as an ...

8. Square-free integer - Wikipedia

   en.wikipedia.org/wiki/Square-free_integer

   In mathematics, a square-free integer (or squarefree integer) is an integer which is divisible by no square number other than 1. That is, its prime factorization has exactly one factor for each prime that appears in it. For example, 10 = 2 ⋅ 5 is square-free, but 18 = 2 ⋅ 3 ⋅ 3 is not, because 18 is divisible by 9 = 32.

9. List of hexagrams of the I Ching - Wikipedia

   en.wikipedia.org/wiki/List_of_hexagrams_of_the_I...

   Hexagram 25. Hexagram 25 is named 無妄 (wú wàng), "Without Embroiling". Other variations include "innocence (the unexpected)" and "pestilence". Its inner (lower) trigram is ☳ (震 zhèn) shake = thunder, and its outer (upper) trigram is ☰ (乾 qián) force = heaven.