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2 (two) is a number, numeral and digit. It is the natural number following 1 and preceding 3. It is the smallest and only even prime number. Because it forms the basis of a duality, it has religious and spiritual significance in many cultures.
21 (twenty-one) is the natural number following 20 and preceding 22.
1000 or one thousand is the natural number following 999 and preceding 1001. In most English-speaking countries, it can be written with or without a comma or sometimes a period separating the thousands digit: 1,000.
300 is the natural number following 299 and preceding 301.
144 is the natural number following 143 and preceding 145. 144 is a dozen dozens, or one gross.
700 is the natural number following 699 and preceding 701.
600 is the natural number following 599 and preceding 601.
800 is the natural number following 799 and preceding 801.
900 is the natural number following 899 and preceding 901. It is the square of 30 and the sum of Euler's totient function for the first 54 positive integers. In base 10 it is a Harshad number. It is also the first number to be the square of a sphenic number.
2000 is a natural number following 1999 and preceding 2001.
4000 is the natural number following 3999 and preceding 4001. It is a decagonal number.
6000 is the natural number following 5999 and preceding 6001.
One million (1,000,000), or one thousand thousand, is the natural number following 999,999 and preceding 1,000,001. The word is derived from the early Italian millione, from mille, "thousand", plus the augmentative suffix -one.
1,000,000,000 is the natural number following 999,999,999 and preceding 1,000,000,001. With a number, "billion" can be abbreviated as b, bil or bn.
100,000 (one hundred thousand) is the natural number following 99,999 and preceding 100,001. In scientific notation, it is written as 105.
149 is the natural number between 148 and 150.
10,000,000 is the natural number following 9,999,999 and preceding 10,000,001.
100,000,000 is the natural number following 99,999,999 and preceding 100,000,001.
20,000 is the natural number that comes after 19,999 and before 20,001.
40,000 is the natural number that comes after 39,999 and before 40,001. It is the square of 200.
References
- ↑ Sloane, N. J. A. (ed.), "SequenceA111032(Non-Fibonacci Markoff numbers)", The On-Line Encyclopedia of Integer Sequences , OEIS Foundation
- ↑ Sloane, N. J. A. (ed.), "SequenceA095809(Least positive number having exactly n partitions into three squares)", The On-Line Encyclopedia of Integer Sequences , OEIS Foundation
- ↑ Duncan, John F. R.; Griffin, Michael J.; Ono, Ken (2015), "Moonshine", Research in the Mathematical Sciences, 2: A11:1–A11:57, arXiv: 1411.6571 , doi:10.1186/s40687-015-0029-6, MR 3375653, S2CID 256430530
- ↑ Sloane, N. J. A. (ed.). "SequenceA007749(Numbers k such that k!! - 1 is prime)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-24.
